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n in (-oo:+oo)
n/4 = -5/7 // + -5/7
n/4-(-5/7) = 0
n/4+5/7 = 0
1/4*n+5/7 = 0 // - 5/7
1/4*n = -5/7 // : 1/4
n = -5/7/1/4
n = -20/7
n = -20/7
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