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3x+9=5x-31
We move all terms to the left:
3x+9-(5x-31)=0
We get rid of parentheses
3x-5x+31+9=0
We add all the numbers together, and all the variables
-2x+40=0
We move all terms containing x to the left, all other terms to the right
-2x=-40
x=-40/-2
x=+20
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