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8(1+2a)=-104
We move all terms to the left:
8(1+2a)-(-104)=0
We add all the numbers together, and all the variables
8(2a+1)-(-104)=0
We add all the numbers together, and all the variables
8(2a+1)+104=0
We multiply parentheses
16a+8+104=0
We add all the numbers together, and all the variables
16a+112=0
We move all terms containing a to the left, all other terms to the right
16a=-112
a=-112/16
a=-7
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