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z in (-oo:+oo)
(-1/6)*z = -7.5 // + 7.5
(-1/6)*z+7.5 = 0
7.5-1/6*z = 0 // - 7.5
-1/6*z = -7.5 // : -1/6
z = -7.5/(-1/6)
z = 44.9999991
z = 44.9999991
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