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z in (-oo:+oo)
(4/5)*(10*z-15) = 20 // - 20
(4/5)*(10*z-15)-20 = 0
4/5*(10*z-15)-20 = 0
4/5*(10*z-15)-20 = 0
8*z-32 = 0
8*z-32 = 0
8*z-32 = 0 // + 32
8*z = 32 // : 8
z = 32/8
z = 4
z = 4
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