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n in (-oo:+oo)
49*n = 7/10 // - 7/10
49*n-(7/10) = 0
49*n-7/10 = 0
49*n-7/10 = 0 // + 7/10
49*n = 7/10 // : 49
n = 7/10/49
n = 1/70
n = 1/70
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