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z in (-oo:+oo)
12-((5*z)/437) = 0
(-5/437)*z+12 = 0
12-5/437*z = 0 // - 12
-5/437*z = -12 // : -5/437
z = -12/(-5/437)
z = 5244/5
z = 5244/5
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