Answer:
Step-by-step explanation:
1) x + 7 = 12
Add the additive inverse of 7 = -7 to both sides
x + 7 - 7 = 12 - 7
x + 0 = 5
x = 5
2) 7a = -28
Divide both sides by 7
7a/7 = -28/7
a = -4
[tex]3)\frac{y}{8}= -3\\\\[/tex]
Multiply both sides by 8
[tex]\frac{y}8}*8=-3*8\\\\y=-24[/tex]
