Solve for d
d=30
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8d-80-2d=100
Subtract 2d from both sides.
6d-80=100
Combine 8d and -2d to get 6d.
6d=100+80
Add 80 to both sides.
6d=180
Add 100 and 80 to get 180.
d=\frac{180}{6}
Divide both sides by 6.
d=30
Divide 180 by 6 to get 30.
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