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11x+12=9x-31
We move all terms to the left:
11x+12-(9x-31)=0
We get rid of parentheses
11x-9x+31+12=0
We add all the numbers together, and all the variables
2x+43=0
We move all terms containing x to the left, all other terms to the right
2x=-43
x=-43/2
x=-21+1/2
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