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(3*h-12)/h = x // - x
(3*h-12)/h-x = 0
(3*h-12)/h+(h*(-x))/h = 0
3*h+h*(-x)-12 = 0
3*h-(h*x)-12 = 0
(3*h-(h*x)-12)/h = 0
(3*h-(h*x)-12)/h = 0 // * h
3*h-(h*x)-12 = 0
3*h-h*x-12 = 0 // - 3*h-12
-h*x = -(3*h-12) // : -h
x = (-(3*h-12))/(-h)
x = -(h^-1*(12-(3*h)))
x = -(h^-1*(12-(3*h)))
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