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z in (-oo:+oo)
15*(-1/6) = -6*(-1/6)*z // + -6*(-1/6)*z
15*(-1/6)-(-6*(-1/6)*z) = 0
15*(-1/6)-z = 0
-z-5/2 = 0 // + 5/2
-z = 5/2 // * -1
z = -5/2
z = -5/2
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