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n in (-oo:+oo)
6*n+3/10 = 43/10 // - 43/10
6*n+3/10-(43/10) = 0
6*n+3/10-43/10 = 0
6*n-4 = 0 // + 4
6*n = 4 // : 6
n = 4/6
n = 2/3
n = 2/3
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