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h in (-oo:+oo)
(7*h)/12-(4*h) = 18/12 // - 18/12
(7*h)/12-(4*h)-(18/12) = 0
(7*h)/12-4*h-3/2 = 0
-41/12*h-3/2 = 0 // + 3/2
-41/12*h = 3/2 // : -41/12
h = 3/2/(-41/12)
h = -18/41
h = -18/41
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