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7x+2(-x+9)=68
We move all terms to the left:
7x+2(-x+9)-(68)=0
We add all the numbers together, and all the variables
7x+2(-1x+9)-68=0
We multiply parentheses
7x-2x+18-68=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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