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z in (-oo:+oo)
3/7 = z/84 // - z/84
3/7-(z/84) = 0
3/7-1/84*z = 0 // - 3/7
-1/84*z = -3/7 // : -1/84
z = -3/7/(-1/84)
z = 36
z = 36
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