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(3x+4)+(x+10)=90
We move all terms to the left:
(3x+4)+(x+10)-(90)=0
We get rid of parentheses
3x+x+4+10-90=0
We add all the numbers together, and all the variables
4x-76=0
We move all terms containing x to the left, all other terms to the right
4x=76
x=76/4
x=19
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