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3x-90=4x-159
We move all terms to the left:
3x-90-(4x-159)=0
We get rid of parentheses
3x-4x+159-90=0
We add all the numbers together, and all the variables
-1x+69=0
We move all terms containing x to the left, all other terms to the right
-x=-69
x=-69/-1
x=+69
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