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h in (-oo:+oo)
(3/5)*h+4 = -12/5-1 // + -12/5-1
(3/5)*h-(-12/5)+1+4 = 0
(3/5)*h+12/5+1+4 = 0
3/5*h+37/5 = 0 // - 37/5
3/5*h = -37/5 // : 3/5
h = -37/5/3/5
h = -37/3
h = -37/3
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