Solve for d
d=-12
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3+d=2\left(6+d\right)+3
Add 3 and 3 to get 6.
3+d=12+2d+3
Use the distributive property to multiply 2 by 6+d.
3+d=15+2d
Add 12 and 3 to get 15.
3+d-2d=15
Subtract 2d from both sides.
3-d=15
Combine d and -2d to get -d.
-d=15-3
Subtract 3 from both sides.
-d=12
Subtract 3 from 15 to get 12.
d=-12
Multiply both sides by -1.
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