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(5x-30)=90
We move all terms to the left:
(5x-30)-(90)=0
We get rid of parentheses
5x-30-90=0
We add all the numbers together, and all the variables
5x-120=0
We move all terms containing x to the left, all other terms to the right
5x=120
x=120/5
x=24
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