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3x=4x-125
We move all terms to the left:
3x-(4x-125)=0
We get rid of parentheses
3x-4x+125=0
We add all the numbers together, and all the variables
-1x+125=0
We move all terms containing x to the left, all other terms to the right
-x=-125
x=-125/-1
x=+125
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