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h in (-oo:+oo)
h+2*h-(3/3)-(1/12) = 0
h+2*h-1/12-1 = 0
3*h-13/12 = 0 // + 13/12
3*h = 13/12 // : 3
h = 13/12/3
h = 13/36
h = 13/36
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