Solve for a
a=-\left(b-3d+6\right)
Solve for b
b=-\left(a-3d+6\right)
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a+6=3d-b
Subtract b from both sides.
a=3d-b-6
Subtract 6 from both sides.
b+6=3d-a
Subtract a from both sides.
b=3d-a-6
Subtract 6 from both sides.
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