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x+2(x+8)=1
We move all terms to the left:
x+2(x+8)-(1)=0
We multiply parentheses
x+2x+16-1=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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