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h in (-oo:+oo)
(3*h-5)/12 = 7 // - 7
(3*h-5)/12-7 = 0
(3*h-5)/12+(-7*12)/12 = 0
3*h-7*12-5 = 0
3*h-89 = 0
(3*h-89)/12 = 0
(3*h-89)/12 = 0 // * 12
3*h-89 = 0
3*h-89 = 0 // + 89
3*h = 89 // : 3
h = 89/3
h = 89/3
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