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z in (-oo:+oo)
(-1/6)*z = -2.5 // + 2.5
(-1/6)*z+2.5 = 0
2.5-1/6*z = 0 // - 2.5
-1/6*z = -2.5 // : -1/6
z = -2.5/(-1/6)
z = 14.9999997
z = 14.9999997
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