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z in (-oo:+oo)
20-(2/3) = z/2 // - z/2
20-(z/2)-(2/3) = 0
20-(z/2)-2/3 = 0
58/3-1/2*z = 0 // - 58/3
-1/2*z = -58/3 // : -1/2
z = -58/3/(-1/2)
z = 116/3
z = 116/3
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