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n in (-oo:+oo)
(2*n)/3+n/3+1/3 = -42/3 // + -42/3
(2*n)/3+n/3+1/3-(-42/3) = 0
(2*n)/3+n/3+1/3+14 = 0
n+43/3 = 0 // - 43/3
n = -43/3
n = -43/3
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