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z in (-oo:+oo)
2/3 = z/12 // - z/12
2/3-(z/12) = 0
2/3-1/12*z = 0 // - 2/3
-1/12*z = -2/3 // : -1/12
z = -2/3/(-1/12)
z = 8
z = 8
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