Question

1. (-5m + 3x) + (-7m + 10x) + 5

Explanation:

Step1: Remove parentheses

$(-5m + 3x) + (-7m + 10x) + 5 = -5m + 3x -7m + 10x + 5$

Step2: Combine like terms for $m$

$-5m -7m + 3x + 10x + 5 = (-5-7)m + 3x + 10x + 5 = -12m + 3x + 10x + 5$

Step3: Combine like terms for $x$

$-12m + (3+10)x + 5 = -12m + 13x + 5$

Answer:

$-12m + 13x + 5$