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z in (-oo:+oo)
3/10 = 5*z+5 // - 5*z+5
3/10-(5*z)-5 = 0
3/10-5*z-5 = 0
-5*z-47/10 = 0 // + 47/10
-5*z = 47/10 // : -5
z = 47/10/(-5)
z = -47/50
z = -47/50
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