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(4x-20)+(2x-10)=90
We move all terms to the left:
(4x-20)+(2x-10)-(90)=0
We get rid of parentheses
4x+2x-20-10-90=0
We add all the numbers together, and all the variables
6x-120=0
We move all terms containing x to the left, all other terms to the right
6x=120
x=120/6
x=20
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