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z in (-oo:+oo)
(4*z)/7 = 28/3 // - 28/3
(4*z)/7-(28/3) = 0
(4*z)/7-28/3 = 0
4/7*z-28/3 = 0 // + 28/3
4/7*z = 28/3 // : 4/7
z = 28/3/4/7
z = 49/3
z = 49/3
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