Answer:
x = -7
Step-by-step explanation:
Combine like terms: (Subtract 4x from both sides, and subtract 12 from both sides)
4x - 9 = 7x + 12
-9 - 12 = 7x - 4x
-21 = 3x
Divide by 3:
-21 = 3x
x = -21 / 3
x = -7
Plug in to check your answer:
4x - 9 = 4(-7) - 9 = -37
7x + 12 = 7(-7) + 12 = -37
