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z in (-oo:+oo)
(-4/5)*z-((2/5)*z) = 3/5+3/5 // - 3/5+3/5
(-4/5)*z-((2/5)*z)-(3/5)-(3/5) = 0
(-4/5)*z+(-2/5)*z-3/5-3/5 = 0
-6/5*z-6/5 = 0 // + 6/5
-6/5*z = 6/5 // : -6/5
z = 6/5/(-6/5)
z = -1
z = -1
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