Solve for a
a=\frac{H-4}{2}
Solve for H
H=2\left(a+2\right)
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2a+4=H
Swap sides so that all variable terms are on the left hand side.
2a=H-4
Subtract 4 from both sides.
\frac{2a}{2}=\frac{H-4}{2}
Divide both sides by 2.
a=\frac{H-4}{2}
Dividing by 2 undoes the multiplication by 2.
a=\frac{H}{2}-2
Divide H-4 by 2.
Examples
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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