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n in (-oo:+oo)
(2/3)*n-4 = -20/3 // + -20/3
(2/3)*n-(-20/3)-4 = 0
(2/3)*n+20/3-4 = 0
2/3*n+8/3 = 0 // - 8/3
2/3*n = -8/3 // : 2/3
n = -8/3/2/3
n = -4
n = -4
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