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z in (-oo:+oo)
(3*z)/7-7 = 3 // - 3
(3*z)/7-7-3 = 0
3/7*z-10 = 0 // + 10
3/7*z = 10 // : 3/7
z = 10/3/7
z = 70/3
z = 70/3
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