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(2x+20)+(4x-2)=90
We move all terms to the left:
(2x+20)+(4x-2)-(90)=0
We get rid of parentheses
2x+4x+20-2-90=0
We add all the numbers together, and all the variables
6x-72=0
We move all terms containing x to the left, all other terms to the right
6x=72
x=72/6
x=12
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