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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 = 0
3*h-89/12 = 0 // + 89/12
3*h = 89/12 // : 3
h = 89/12/3
h = 89/36
h = 89/36
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