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z in (-oo:+oo)
(5/4)*z-10 = (-5/4)*(8-z) // - (-5/4)*(8-z)
(5/4)*z-((-5/4)*(8-z))-10 = 0
(5/4)*(8-z)+(5/4)*z-10 = 0
5/4*(8-z)+(5*z)/4-10 = 0
(5/4*4*(8-z))/4+(5*z)/4+(-10*4)/4 = 0
5/4*4*(8-z)+5*z-10*4 = 0
40-40 = 0
0 = 0
0/4 = 0
0/4 = 0 // * 4
0 = 0
z belongs to the empty set
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