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z in (-oo:+oo)
z/7 = z/6-2 // - z/6-2
z/7-(z/6)+2 = 0
2-1/42*z = 0 // - 2
-1/42*z = -2 // : -1/42
z = -2/(-1/42)
z = 84
z = 84
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