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(3x+16)+(4x-4)=90
We move all terms to the left:
(3x+16)+(4x-4)-(90)=0
We get rid of parentheses
3x+4x+16-4-90=0
We add all the numbers together, and all the variables
7x-78=0
We move all terms containing x to the left, all other terms to the right
7x=78
x=78/7
x=11+1/7
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