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z in (-oo:+oo)
1/3-(z/5) = 7/15 // - 7/15
1/3-(z/5)-(7/15) = 0
1/3-(z/5)-7/15 = 0
-1/5*z-2/15 = 0 // + 2/15
-1/5*z = 2/15 // : -1/5
z = 2/15/(-1/5)
z = -2/3
z = -2/3
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