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z in (-oo:+oo)
3/7 = z/27 // - z/27
3/7-(z/27) = 0
3/7-1/27*z = 0 // - 3/7
-1/27*z = -3/7 // : -1/27
z = -3/7/(-1/27)
z = 81/7
z = 81/7
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