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(3x+1)+(x+2)2=65
We move all terms to the left:
(3x+1)+(x+2)2-(65)=0
We multiply parentheses
(3x+1)+2x+4-65=0
We get rid of parentheses
3x+2x+1+4-65=0
We add all the numbers together, and all the variables
5x-60=0
We move all terms containing x to the left, all other terms to the right
5x=60
x=60/5
x=12
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