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h in (-oo:+oo)
(3/5)*h+4 = (12/5)*h-1 // - (12/5)*h-1
(3/5)*h-((12/5)*h)+1+4 = 0
(3/5)*h+(-12/5)*h+1+4 = 0
5-9/5*h = 0 // - 5
-9/5*h = -5 // : -9/5
h = -5/(-9/5)
h = 25/9
h = 25/9
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