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z in (-oo:+oo)
7/8 = z/12 // - z/12
7/8-(z/12) = 0
7/8-1/12*z = 0 // - 7/8
-1/12*z = -7/8 // : -1/12
z = -7/8/(-1/12)
z = 21/2
z = 21/2
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