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\frac{4}{5}a+h=D
Swap sides so that all variable terms are on the left hand side.
\frac{4}{5}a=D-h
Subtract h from both sides.
\frac{\frac{4}{5}a}{\frac{4}{5}}=\frac{D-h}{\frac{4}{5}}
Divide both sides of the equation by \frac{4}{5}, which is the same as multiplying both sides by the reciprocal of the fraction.
a=\frac{D-h}{\frac{4}{5}}
Dividing by \frac{4}{5} undoes the multiplication by \frac{4}{5}.
a=\frac{5D-5h}{4}
Divide D-h by \frac{4}{5} by multiplying D-h by the reciprocal of \frac{4}{5}.