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x+2(x+6)=30
We move all terms to the left:
x+2(x+6)-(30)=0
We multiply parentheses
x+2x+12-30=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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