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h in (-oo:+oo)
(3/5)*h+4 = (7/5)*h-1 // - (7/5)*h-1
(3/5)*h-((7/5)*h)+1+4 = 0
(3/5)*h+(-7/5)*h+1+4 = 0
5-4/5*h = 0 // - 5
-4/5*h = -5 // : -4/5
h = -5/(-4/5)
h = 25/4
h = 25/4
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