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3x-57=4x-90
We move all terms to the left:
3x-57-(4x-90)=0
We get rid of parentheses
3x-4x+90-57=0
We add all the numbers together, and all the variables
-1x+33=0
We move all terms containing x to the left, all other terms to the right
-x=-33
x=-33/-1
x=+33
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