Question

1. $15y - 7y + 7 + 5 = \underline{\quad\quad\quad}$

Explanation:

Step1: Combine like variable terms

$15y - 7y = 8y$

Step2: Combine constant terms

$7 + 5 = 12$

Step3: Combine results

$8y + 12$

Answer:

$8y + 12$