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