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n in (-oo:+oo)
(1/7)*n+1/3 = -11/21 // + -11/21
(1/7)*n+1/3-(-11/21) = 0
(1/7)*n+1/3+11/21 = 0
1/7*n+6/7 = 0 // - 6/7
1/7*n = -6/7 // : 1/7
n = -6/7/1/7
n = -6
n = -6
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