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z in (-oo:+oo)
(-1/4)*z = 8/5 // - 8/5
(-1/4)*z-(8/5) = 0
(-1/4)*z-8/5 = 0
-1/4*z-8/5 = 0 // + 8/5
-1/4*z = 8/5 // : -1/4
z = 8/5/(-1/4)
z = -32/5
z = -32/5
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