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n in (-oo:+oo)
(1/2)*n-(2/9) = -49/72 // + -49/72
(1/2)*n-(2/9)-(-49/72) = 0
(1/2)*n-2/9+49/72 = 0
1/2*n+11/24 = 0 // - 11/24
1/2*n = -11/24 // : 1/2
n = -11/24/1/2
n = -11/12
n = -11/12
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