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