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z in (-oo:+oo)
5/2 = (3*z)/4+1/2 // - (3*z)/4+1/2
5/2-((3*z)/4)-(1/2) = 0
(-3/4)*z+5/2-1/2 = 0
2-3/4*z = 0 // - 2
-3/4*z = -2 // : -3/4
z = -2/(-3/4)
z = 8/3
z = 8/3
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