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3x + 12 = -7x - 28
First, move all variables to one side and numbers to the other. There are several different ways to begin, but let's move the 12 by subtraction from both sides.
3x = -7x - 40 is the new equation. Next, move the -7x to the left by addition to both sides.
10x = -40
Divide both sides by 10
x = -4
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