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z in (-oo:+oo)
30 = (5/12)*z // - (5/12)*z
30-((5/12)*z) = 0
(-5/12)*z+30 = 0
30-5/12*z = 0 // - 30
-5/12*z = -30 // : -5/12
z = -30/(-5/12)
z = 72
z = 72
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