Question

combine any like terms in the expression. if there are no like terms, rewrite the expression.
$42mn + 12mn + 6mn - 4mn - 43mn$

Explanation:

Step1: Factor out common term $mn$

$mn(42 + 12 + 6 - 4 - 43)$

Step2: Calculate the numeric sum

$42+12=54$; $54+6=60$; $60-4=56$; $56-43=13$

Step3: Multiply back by $mn$

$mn \times 13$

Answer:

$13mn$