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-3x-5=x+31
We move all terms to the left:
-3x-5-(x+31)=0
We get rid of parentheses
-3x-x-31-5=0
We add all the numbers together, and all the variables
-4x-36=0
We move all terms containing x to the left, all other terms to the right
-4x=36
x=36/-4
x=-9
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