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z in (-oo:+oo)
(2*z)/7-5 = 4 // - 4
(2*z)/7-5-4 = 0
2/7*z-9 = 0 // + 9
2/7*z = 9 // : 2/7
z = 9/2/7
z = 63/2
z = 63/2
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