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h in (-oo:+oo)
(1/5)*(h+100) = 50 // - 50
(1/5)*(h+100)-50 = 0
1/5*(h+100)-50 = 0
1/5*(h+100)-50 = 0
1/5*h-30 = 0
1/5*h-30 = 0
1/5*h-30 = 0 // + 30
1/5*h = 30 // : 1/5
h = 30/1/5
h = 150
h = 150
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