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z in (-oo:+oo)
1/6-(z/8) = -3/7 // + -3/7
1/6-(z/8)-(-3/7) = 0
1/6-(z/8)+3/7 = 0
25/42-1/8*z = 0 // - 25/42
-1/8*z = -25/42 // : -1/8
z = -25/42/(-1/8)
z = 100/21
z = 100/21
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