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n in (-oo:+oo)
n/7 = 90/14 // - 90/14
n/7-(90/14) = 0
n/7-45/7 = 0
1/7*n-45/7 = 0 // + 45/7
1/7*n = 45/7 // : 1/7
n = 45/7/1/7
n = 45
n = 45
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