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10(d+9)=-80
We move all terms to the left:
10(d+9)-(-80)=0
We add all the numbers together, and all the variables
10(d+9)+80=0
We multiply parentheses
10d+90+80=0
We add all the numbers together, and all the variables
10d+170=0
We move all terms containing d to the left, all other terms to the right
10d=-170
d=-170/10
d=-17
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