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z in (-oo:+oo)
1/5-(7/3) = z/15 // - z/15
1/5-(z/15)-(7/3) = 0
1/5-(z/15)-7/3 = 0
-1/15*z-32/15 = 0 // + 32/15
-1/15*z = 32/15 // : -1/15
z = 32/15/(-1/15)
z = -32
z = -32
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