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7(x+1)+8(x+2)=-6
We move all terms to the left:
7(x+1)+8(x+2)-(-6)=0
We add all the numbers together, and all the variables
7(x+1)+8(x+2)+6=0
We multiply parentheses
7x+8x+7+16+6=0
We add all the numbers together, and all the variables
15x+29=0
We move all terms containing x to the left, all other terms to the right
15x=-29
x=-29/15
x=-1+14/15
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