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2x+9=3x-31
We move all terms to the left:
2x+9-(3x-31)=0
We get rid of parentheses
2x-3x+31+9=0
We add all the numbers together, and all the variables
-1x+40=0
We move all terms containing x to the left, all other terms to the right
-x=-40
x=-40/-1
x=+40
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