Question

3,5\frac{3}{5} - 7 - 31,5y + 2,1

Explanation:

Step1: Convert mixed number to decimal

First, convert \( 5\frac{3}{5} \) to decimal. \( \frac{3}{5} = 0.6 \), so \( 5\frac{3}{5}=5 + 0.6 = 5.6 \). Then the term \( 3.5\frac{3}{5} \) seems to be a typo, maybe it's \( 3.5\times5\frac{3}{5} \)? Wait, maybe it's \( 5\frac{3}{5}-7 - 37.5y+2.1 \)? Wait, the original expression is a bit unclear. Assuming it's \( 5\frac{3}{5}-7 - 37.5y+2.1 \):
First, convert \( 5\frac{3}{5} \) to decimal: \( 5\frac{3}{5}=5.6 \)

Step2: Combine constant terms

Now combine the constant terms: \( 5.6-7 + 2.1 \)
\( 5.6+2.1=7.7 \), then \( 7.7 - 7 = 0.7 \)

Step3: Write the simplified expression

So the simplified expression is \( 0.7-37.5y \) or if we consider the first term as \( 3.5\times5\frac{3}{5} \):
First, \( 5\frac{3}{5}=5.6 \), then \( 3.5\times5.6 = 19.6 \)
Then \( 19.6-7 - 37.5y+2.1 \)
Combine constants: \( 19.6-7 + 2.1=14.7 \)
So expression is \( 14.7-37.5y \)
Assuming the first term is \( 5\frac{3}{5} \) (maybe a typo in the coefficient 3.5), let's re - evaluate:
If the expression is \( 5\frac{3}{5}-7 - 37.5y+2.1 \)

Step1: Convert mixed number

\( 5\frac{3}{5}=5 + \frac{3}{5}=5 + 0.6 = 5.6 \)

Step2: Combine like terms (constants)

\( 5.6-7+2.1=(5.6 + 2.1)-7=7.7 - 7 = 0.7 \)

Step3: Final expression

The expression simplifies to \( 0.7-37.5y \) or \( \frac{7}{10}- \frac{75}{2}y \) (converting decimals to fractions: \( 0.7=\frac{7}{10} \), \( 37.5=\frac{75}{2} \))

Answer:

If the original expression is \( 5\frac{3}{5}-7 - 37.5y+2.1 \), the simplified form is \( 0.7 - 37.5y\) (or \( \frac{7}{10}-\frac{75}{2}y\)). If the first term is \( 3.5\times5\frac{3}{5}-7 - 37.5y+2.1 \), the simplified form is \( 14.7-37.5y\) (or \( \frac{147}{10}-\frac{75}{2}y\)). Given the original hand - written expression's ambiguity, assuming the first term is \( 5\frac{3}{5}\) (correcting the 3.5 typo), the answer is \( 0.7 - 37.5y\)