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z in (-oo:+oo)
1/4-((1/5)*z) = 0
(-1/5)*z+1/4 = 0
1/4-1/5*z = 0 // - 1/4
-1/5*z = -1/4 // : -1/5
z = -1/4/(-1/5)
z = 5/4
z = 5/4
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