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(3x+10)+(4x-10)=90
We move all terms to the left:
(3x+10)+(4x-10)-(90)=0
We get rid of parentheses
3x+4x+10-10-90=0
We add all the numbers together, and all the variables
7x-90=0
We move all terms containing x to the left, all other terms to the right
7x=90
x=90/7
x=12+6/7
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