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x+3(x)+(x+6)=66
We move all terms to the left:
x+3(x)+(x+6)-(66)=0
We add all the numbers together, and all the variables
4x+(x+6)-66=0
We get rid of parentheses
4x+x+6-66=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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