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z in (-oo:+oo)
1/2-((17/25)*z) = 12/25-((1/10)*z) // - 12/25-((1/10)*z)
(1/10)*z-((17/25)*z)+1/2-(12/25) = 0
(-17/25)*z+(1/10)*z+1/2-12/25 = 0
1/50-29/50*z = 0 // - 1/50
-29/50*z = -1/50 // : -29/50
z = -1/50/(-29/50)
z = 1/29
z = 1/29
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