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z in (-oo:+oo)
(-3/5)*z = 9/20 // - 9/20
(-3/5)*z-(9/20) = 0
(-3/5)*z-9/20 = 0
-3/5*z-9/20 = 0 // + 9/20
-3/5*z = 9/20 // : -3/5
z = 9/20/(-3/5)
z = -3/4
z = -3/4
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