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z in (-oo:+oo)
z/4 = 7/6 // - 7/6
z/4-(7/6) = 0
z/4-7/6 = 0
1/4*z-7/6 = 0 // + 7/6
1/4*z = 7/6 // : 1/4
z = 7/6/1/4
z = 14/3
z = 14/3
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