Solve for b
b=2\left(d-4\right)
Solve for d
d=\frac{b+8}{2}
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-b=8-2d
Subtract 2d from both sides.
\frac{-b}{-1}=\frac{8-2d}{-1}
Divide both sides by -1.
b=\frac{8-2d}{-1}
Dividing by -1 undoes the multiplication by -1.
b=2d-8
Divide 8-2d by -1.
2d=8+b
Add b to both sides.
2d=b+8
The equation is in standard form.
\frac{2d}{2}=\frac{b+8}{2}
Divide both sides by 2.
d=\frac{b+8}{2}
Dividing by 2 undoes the multiplication by 2.
d=\frac{b}{2}+4
Divide 8+b by 2.
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