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n in (-oo:+oo)
(7/3)*n = -14/3 // + -14/3
(7/3)*n-(-14/3) = 0
(7/3)*n+14/3 = 0
7/3*n+14/3 = 0 // - 14/3
7/3*n = -14/3 // : 7/3
n = -14/3/7/3
n = -2
n = -2
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