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(3x+6)+(7x-14)=90
We move all terms to the left:
(3x+6)+(7x-14)-(90)=0
We get rid of parentheses
3x+7x+6-14-90=0
We add all the numbers together, and all the variables
10x-98=0
We move all terms containing x to the left, all other terms to the right
10x=98
x=98/10
x=9+4/5
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