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z in (-oo:+oo)
(5*z)/3 = 3*z-20 // - 3*z-20
(5*z)/3-(3*z)+20 = 0
(5*z)/3-3*z+20 = 0
20-4/3*z = 0 // - 20
-4/3*z = -20 // : -4/3
z = -20/(-4/3)
z = 15
z = 15
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