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h in (-oo:+oo)
8 = (-2/3)*h // - (-2/3)*h
8-((-2/3)*h) = 0
(2/3)*h+8 = 0
2/3*h+8 = 0 // - 8
2/3*h = -8 // : 2/3
h = -8/2/3
h = -12
h = -12
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