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n in (-oo:+oo)
2*n+2/7 = 41/21 // - 41/21
2*n+2/7-(41/21) = 0
2*n+2/7-41/21 = 0
2*n-5/3 = 0 // + 5/3
2*n = 5/3 // : 2
n = 5/3/2
n = 5/6
n = 5/6
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