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(5x-90)=2x
We move all terms to the left:
(5x-90)-(2x)=0
We add all the numbers together, and all the variables
-2x+(5x-90)=0
We get rid of parentheses
-2x+5x-90=0
We add all the numbers together, and all the variables
3x-90=0
We move all terms containing x to the left, all other terms to the right
3x=90
x=90/3
x=30
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