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z in (-oo:+oo)
(7/3)*z-6 = -2 // + 2
(7/3)*z-6+2 = 0
7/3*z-4 = 0 // + 4
7/3*z = 4 // : 7/3
z = 4/7/3
z = 12/7
z = 12/7
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