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z in (-oo:+oo)
(4*z)/7-1 = 2 // - 2
(4*z)/7-2-1 = 0
4/7*z-3 = 0 // + 3
4/7*z = 3 // : 4/7
z = 3/4/7
z = 21/4
z = 21/4
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