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