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z in (-oo:+oo)
(2*z)/5-(4*z)-(3/10) = 1/10-z // - 1/10-z
(2*z)/5-(4*z)+z-(3/10)-(1/10) = 0
(2*z)/5-4*z+z-3/10-1/10 = 0
-13/5*z-2/5 = 0 // + 2/5
-13/5*z = 2/5 // : -13/5
z = 2/5/(-13/5)
z = -2/13
z = -2/13
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