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z in (-oo:+oo)
15-((5*z)/4) = -z // + z
z-((5*z)/4)+15 = 0
(-5/4)*z+z+15 = 0
15-1/4*z = 0 // - 15
-1/4*z = -15 // : -1/4
z = -15/(-1/4)
z = 60
z = 60
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