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z in (-oo:+oo)
15/2 = (-1/2)*z // - (-1/2)*z
15/2-((-1/2)*z) = 0
(1/2)*z+15/2 = 0
1/2*z+15/2 = 0 // - 15/2
1/2*z = -15/2 // : 1/2
z = -15/2/1/2
z = -15
z = -15
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