Solve for d
d=\frac{x+50}{5}
Solve for x
x=5\left(d-10\right)
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4x+5d=5x+50
Swap sides so that all variable terms are on the left hand side.
5d=5x+50-4x
Subtract 4x from both sides.
5d=x+50
Combine 5x and -4x to get x.
\frac{5d}{5}=\frac{x+50}{5}
Divide both sides by 5.
d=\frac{x+50}{5}
Dividing by 5 undoes the multiplication by 5.
d=\frac{x}{5}+10
Divide x+50 by 5.
5x+50-4x=5d
Subtract 4x from both sides.
x+50=5d
Combine 5x and -4x to get x.
x=5d-50
Subtract 50 from both sides.
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