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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-70=0
We move all terms containing x to the left, all other terms to the right
7x=70
x=70/7
x=10
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