Solve for d
d=-6
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4d+20=9d+50
Combine 7d and -3d to get 4d.
4d+20-9d=50
Subtract 9d from both sides.
-5d+20=50
Combine 4d and -9d to get -5d.
-5d=50-20
Subtract 20 from both sides.
-5d=30
Subtract 20 from 50 to get 30.
d=\frac{30}{-5}
Divide both sides by -5.
d=-6
Divide 30 by -5 to get -6.
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