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3-5x=4x-90
We move all terms to the left:
3-5x-(4x-90)=0
We get rid of parentheses
-5x-4x+90+3=0
We add all the numbers together, and all the variables
-9x+93=0
We move all terms containing x to the left, all other terms to the right
-9x=-93
x=-93/-9
x=10+1/3
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