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n in (-oo:+oo)
2*n+3/5 = 243/55-4*n // - 243/55-4*n
2*n-(-4*n)+3/5-(243/55) = 0
2*n+4*n+3/5-243/55 = 0
6*n-42/11 = 0 // + 42/11
6*n = 42/11 // : 6
n = 42/11/6
n = 7/11
n = 7/11
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