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z in (-oo:+oo)
(-3/5)*z-((1/3)*z) = 2/5-5/3 // - 2/5-5/3
(-3/5)*z-((1/3)*z)-(-5/3)-(2/5) = 0
(-3/5)*z+(-1/3)*z+5/3-2/5 = 0
19/15-14/15*z = 0 // - 19/15
-14/15*z = -19/15 // : -14/15
z = -19/15/(-14/15)
z = 19/14
z = 19/14
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