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z in (-oo:+oo)
-((4*z-65)/4)-15 = 0
(-1*(4*z-65))/4-15 = 0
(-1*(4*z-65))/4+(-15*4)/4 = 0
-1*(4*z-65)-15*4 = 0
5-4*z = 0
(5-4*z)/4 = 0
(5-4*z)/4 = 0 // * 4
5-4*z = 0
5-4*z = 0 // - 5
-4*z = -5 // : -4
z = -5/(-4)
z = 5/4
z = 5/4
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