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9x+2=-2x-31
We move all terms to the left:
9x+2-(-2x-31)=0
We get rid of parentheses
9x+2x+31+2=0
We add all the numbers together, and all the variables
11x+33=0
We move all terms containing x to the left, all other terms to the right
11x=-33
x=-33/11
x=-3
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