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2x+7(2x+9)=79
We move all terms to the left:
2x+7(2x+9)-(79)=0
We multiply parentheses
2x+14x+63-79=0
We add all the numbers together, and all the variables
16x-16=0
We move all terms containing x to the left, all other terms to the right
16x=16
x=16/16
x=1
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