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z in (-oo:+oo)
20-((6*z)/5) = -z // + z
z-((6*z)/5)+20 = 0
(-6/5)*z+z+20 = 0
20-1/5*z = 0 // - 20
-1/5*z = -20 // : -1/5
z = -20/(-1/5)
z = 100
z = 100
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