Question

example: solve each equation
a) $9x + 1 - 7x - 5 = -20$
example: solve each equation
b) $4m - 5(3m + 10) = 126$

Explanation:

Step1: Combine like terms (a)

$9x - 7x + 1 - 5 = -20$
$2x - 4 = -20$

Step2: Isolate variable term (a)

$2x = -20 + 4$
$2x = -16$

Step3: Solve for x (a)

$x = \frac{-16}{2}$
$x = -8$

Step4: Expand parentheses (b)

$4m - 15m - 50 = 126$

Step5: Combine like terms (b)

$-11m - 50 = 126$

Step6: Isolate variable term (b)

$-11m = 126 + 50$
$-11m = 176$

Step7: Solve for m (b)

$m = \frac{176}{-11}$
$m = -16$

Answer:

a) $x = -8$
b) $m = -16$