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h in (-oo:+oo)
(1/5)*(10*h+15)+h = 0
1/5*(10*h+15)+h = 0
1/5*(10*h+15)+h = 0
3*h+3 = 0
3*h+3 = 0
3*h+3 = 0 // - 3
3*h = -3 // : 3
h = -3/3
h = -1
h = -1
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