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z in (-oo:+oo)
(4*z)/7-3 = 4 // - 4
(4*z)/7-4-3 = 0
4/7*z-7 = 0 // + 7
4/7*z = 7 // : 4/7
z = 7/4/7
z = 49/4
z = 49/4
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