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z in (-oo:+oo)
6/(-7) = (3*z)/42 // - (3*z)/42
6/(-7)-((3*z)/42) = 0
(-1/14)*z+6/(-7) = 0
-1/14*z-6/7 = 0 // + 6/7
-1/14*z = 6/7 // : -1/14
z = 6/7/(-1/14)
z = -12
z = -12
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