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9x-(8x+3)=2x-31
We move all terms to the left:
9x-(8x+3)-(2x-31)=0
We get rid of parentheses
9x-8x-2x-3+31=0
We add all the numbers together, and all the variables
-1x+28=0
We move all terms containing x to the left, all other terms to the right
-x=-28
x=-28/-1
x=+28
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