a - f = ch + f - f
a - f = ch (Subtract f from both sides)
(a - f)/c = ch/c
(a - f)/c = h (Divide both sides by c)
h = (a - f)/c
Solve for h. a = ch + f?
a - f = ch + f - f
a - f = ch (Subtract f from both sides)
(a - f)/c = ch/c
(a - f)/c = h (Divide both sides by c)
h = (a - f)/c
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