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-4x-9=6x+31
We move all terms to the left:
-4x-9-(6x+31)=0
We get rid of parentheses
-4x-6x-31-9=0
We add all the numbers together, and all the variables
-10x-40=0
We move all terms containing x to the left, all other terms to the right
-10x=40
x=40/-10
x=-4
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