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z in (-oo:+oo)
1/7-(z/6) = 1/42 // - 1/42
1/7-(z/6)-(1/42) = 0
1/7-(z/6)-1/42 = 0
5/42-1/6*z = 0 // - 5/42
-1/6*z = -5/42 // : -1/6
z = -5/42/(-1/6)
z = 5/7
z = 5/7
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