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2(2x+7)+2(3x-7)=90
We move all terms to the left:
2(2x+7)+2(3x-7)-(90)=0
We multiply parentheses
4x+6x+14-14-90=0
We add all the numbers together, and all the variables
10x-90=0
We move all terms containing x to the left, all other terms to the right
10x=90
x=90/10
x=9
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