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z in (-oo:+oo)
2/3 = z/15 // - z/15
2/3-(z/15) = 0
2/3-1/15*z = 0 // - 2/3
-1/15*z = -2/3 // : -1/15
z = -2/3/(-1/15)
z = 10
z = 10
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