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-3x-125=115+7x
We move all terms to the left:
-3x-125-(115+7x)=0
We add all the numbers together, and all the variables
-3x-(7x+115)-125=0
We get rid of parentheses
-3x-7x-115-125=0
We add all the numbers together, and all the variables
-10x-240=0
We move all terms containing x to the left, all other terms to the right
-10x=240
x=240/-10
x=-24
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