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z in (-oo:+oo)
(3*z)/7-2 = -7 // + 7
(3*z)/7-2+7 = 0
3/7*z+5 = 0 // - 5
3/7*z = -5 // : 3/7
z = -5/3/7
z = -35/3
z = -35/3
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