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9x+3=-8x-31
We move all terms to the left:
9x+3-(-8x-31)=0
We get rid of parentheses
9x+8x+31+3=0
We add all the numbers together, and all the variables
17x+34=0
We move all terms containing x to the left, all other terms to the right
17x=-34
x=-34/17
x=-2
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