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z in (-oo:+oo)
(4*z)/7-3 = 6 // - 6
(4*z)/7-6-3 = 0
4/7*z-9 = 0 // + 9
4/7*z = 9 // : 4/7
z = 9/4/7
z = 63/4
z = 63/4
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