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z in (-oo:+oo)
5-((2/9)*z) = 13-(2/5) // - 13-(2/5)
2/5-((2/9)*z)-13+5 = 0
(-2/9)*z+2/5-13+5 = 0
-2/9*z-38/5 = 0 // + 38/5
-2/9*z = 38/5 // : -2/9
z = 38/5/(-2/9)
z = -171/5
z = -171/5
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