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h in (-oo:+oo)
-15 = (2/5)*(40-(3*h))-5*h // - (2/5)*(40-(3*h))-5*h
-((2/5)*(40-(3*h)))-(-5*h)-15 = 0
(-2/5)*(40-3*h)+5*h-15 = 0
5*h-2/5*(40-3*h)-15 = 0
5*h-2/5*(40-3*h)-15 = 0
31/5*h-16-15 = 0
31/5*h-31 = 0
31/5*h-31 = 0
31/5*h-31 = 0 // + 31
31/5*h = 31 // : 31/5
h = 31/31/5
h = 5
h = 5
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