Solve for d
d=2
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28=12d+12-4d
Use the distributive property to multiply 4 by 3d+3.
28=8d+12
Combine 12d and -4d to get 8d.
8d+12=28
Swap sides so that all variable terms are on the left hand side.
8d=28-12
Subtract 12 from both sides.
8d=16
Subtract 12 from 28 to get 16.
d=\frac{16}{8}
Divide both sides by 8.
d=2
Divide 16 by 8 to get 2.
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