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