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z in (-oo:+oo)
(7*z)/3-2 = 3*z-9 // - 3*z-9
(7*z)/3-(3*z)-2+9 = 0
(7*z)/3-3*z-2+9 = 0
7-2/3*z = 0 // - 7
-2/3*z = -7 // : -2/3
z = -7/(-2/3)
z = 21/2
z = 21/2
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