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8(c-15)=-40
We move all terms to the left:
8(c-15)-(-40)=0
We add all the numbers together, and all the variables
8(c-15)+40=0
We multiply parentheses
8c-120+40=0
We add all the numbers together, and all the variables
8c-80=0
We move all terms containing c to the left, all other terms to the right
8c=80
c=80/8
c=10
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