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-7x-9=-2x+31
We move all terms to the left:
-7x-9-(-2x+31)=0
We get rid of parentheses
-7x+2x-31-9=0
We add all the numbers together, and all the variables
-5x-40=0
We move all terms containing x to the left, all other terms to the right
-5x=40
x=40/-5
x=-8
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