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d/8=-10
We move all terms to the left:
d/8-(-10)=0
We add all the numbers together, and all the variables
d/8+10=0
We multiply all the terms by the denominator
d+10*8=0
We add all the numbers together, and all the variables
d+80=0
We move all terms containing d to the left, all other terms to the right
d=-80
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