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9+2x=4x+125
We move all terms to the left:
9+2x-(4x+125)=0
We get rid of parentheses
2x-4x-125+9=0
We add all the numbers together, and all the variables
-2x-116=0
We move all terms containing x to the left, all other terms to the right
-2x=116
x=116/-2
x=-58
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