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z in (-oo:+oo)
8/3 = z/7 // - z/7
8/3-(z/7) = 0
8/3-1/7*z = 0 // - 8/3
-1/7*z = -8/3 // : -1/7
z = -8/3/(-1/7)
z = 56/3
z = 56/3
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