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h in (-oo:+oo)
(1/5)*(h-1) = 12 // - 12
(1/5)*(h-1)-12 = 0
1/5*(h-1)-12 = 0
1/5*(h-1)-12 = 0
1/5*h-61/5 = 0
1/5*h-61/5 = 0
1/5*h-61/5 = 0 // + 61/5
1/5*h = 61/5 // : 1/5
h = 61/5/1/5
h = 61
h = 61
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