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z in (-oo:+oo)
3/4 = z/7 // - z/7
3/4-(z/7) = 0
3/4-1/7*z = 0 // - 3/4
-1/7*z = -3/4 // : -1/7
z = -3/4/(-1/7)
z = 21/4
z = 21/4
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