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h in (-oo:+oo)
h/12 = 4.8 // - 4.8
h/12-4.8 = 0
1/12*h-4.8 = 0 // + 4.8
1/12*h = 4.8 // : 1/12
h = 4.8/1/12
h = 57.6000023
h = 57.6000023
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