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n in (-oo:+oo)
7*n+3/7 = -291/7 // + -291/7
7*n+3/7-(-291/7) = 0
7*n+3/7+291/7 = 0
7*n+42 = 0 // - 42
7*n = -42 // : 7
n = -42/7
n = -6
n = -6
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