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(10x-30)=90
We move all terms to the left:
(10x-30)-(90)=0
We get rid of parentheses
10x-30-90=0
We add all the numbers together, and all the variables
10x-120=0
We move all terms containing x to the left, all other terms to the right
10x=120
x=120/10
x=12
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