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(9x+7)+(2x+2)=229
We move all terms to the left:
(9x+7)+(2x+2)-(229)=0
We get rid of parentheses
9x+2x+7+2-229=0
We add all the numbers together, and all the variables
11x-220=0
We move all terms containing x to the left, all other terms to the right
11x=220
x=220/11
x=20
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