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h in (-oo:+oo)
(3*h)/12 = 18/12 // - 18/12
(3*h)/12-(18/12) = 0
(3*h)/12-3/2 = 0
1/4*h-3/2 = 0 // + 3/2
1/4*h = 3/2 // : 1/4
h = 3/2/1/4
h = 6
h = 6
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