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8(2x+1)=-40
We move all terms to the left:
8(2x+1)-(-40)=0
We add all the numbers together, and all the variables
8(2x+1)+40=0
We multiply parentheses
16x+8+40=0
We add all the numbers together, and all the variables
16x+48=0
We move all terms containing x to the left, all other terms to the right
16x=-48
x=-48/16
x=-3
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