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z in (-oo:+oo)
17-((1/5)*(20*z+45)) = -5*z-15 // + -5*z-15
15-((1/5)*(20*z+45))-(-5*z)+17 = 0
(-1/5)*(20*z+45)+5*z+15+17 = 0
5*z-1/5*(20*z+45)+15+17 = 0
5*z-1/5*(20*z+45)+15+17 = 0
z-9+15+17 = 0
z+6+17 = 0
z+23 = 0
z+23 = 0
z+23 = 0 // - 23
z = -23
z = -23
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