Answer:
6x + -12 = 3x + 9
Reorder the terms:
-12 + 6x = 3x + 9
Reorder the terms:
-12 + 6x = 9 + 3x
Solving
-12 + 6x = 9 + 3x
Step-by-step explanation:
12 + 6x = 9 + 3x
-12 + 6x = 9 + 3x
-12 + 6x + -3x = 9 + 3x + -3x
6x + -3x = 3x
-12 + 3x = 9 + 3x + -3x
3x + -3x = 0
-12 + 3x = 9 + 0
-12 + 3x = 9
-12 + 12 + 3x = 9 + 12
-12 + 12 = 0
0 + 3x = 9 + 12
3x = 9 + 12
9 + 12 = 21
3x = 21
Divide each side by 3
x = 7
