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(3x-10)+(x+10)=90
We move all terms to the left:
(3x-10)+(x+10)-(90)=0
We get rid of parentheses
3x+x-10+10-90=0
We add all the numbers together, and all the variables
4x-90=0
We move all terms containing x to the left, all other terms to the right
4x=90
x=90/4
x=22+1/2
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