Question

1. 15y - 7y + 7 + 5 = ______

Explanation:

Step1: Combine like terms with $y$

$15y - 7y = 8y$

Step2: Combine constant terms

$7 + 5 = 12$

Step3: Combine the two results

$8y + 12$

Answer:

$8y + 12$