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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
1/5-13/5*z = 0 // - 1/5
-13/5*z = -1/5 // : -13/5
z = -1/5/(-13/5)
z = 1/13
z = 1/13
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