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z in (-oo:+oo)
(-1/3)*z = 1/4 // - 1/4
(-1/3)*z-(1/4) = 0
(-1/3)*z-1/4 = 0
-1/3*z-1/4 = 0 // + 1/4
-1/3*z = 1/4 // : -1/3
z = 1/4/(-1/3)
z = -3/4
z = -3/4
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