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n in (-oo:+oo)
n/3 = 6.3 // - 6.3
n/3-6.3 = 0
1/3*n-6.3 = 0 // + 6.3
1/3*n = 6.3 // : 1/3
n = 6.3/1/3
n = 18.90000019
n = 18.90000019
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