Question

1.) y + 2y - 7 = 4y + 5

Explanation:

Step1: Combine like terms on left

$y + 2y - 7 = 3y - 7$
So equation becomes: $3y - 7 = 4y + 5$

Step2: Subtract $3y$ from both sides

$3y - 7 - 3y = 4y + 5 - 3y$
Simplify to: $-7 = y + 5$

Step3: Subtract 5 from both sides

$-7 - 5 = y + 5 - 5$
Simplify to: $-12 = y$

Answer:

$y = -12$