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9x-7=-31-3x
We move all terms to the left:
9x-7-(-31-3x)=0
We add all the numbers together, and all the variables
9x-(-3x-31)-7=0
We get rid of parentheses
9x+3x+31-7=0
We add all the numbers together, and all the variables
12x+24=0
We move all terms containing x to the left, all other terms to the right
12x=-24
x=-24/12
x=-2
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