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n in (-oo:+oo)
n/3 = 35/15 // - 35/15
n/3-(35/15) = 0
n/3-7/3 = 0
1/3*n-7/3 = 0 // + 7/3
1/3*n = 7/3 // : 1/3
n = 7/3/1/3
n = 7
n = 7
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