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n in (-oo:+oo)
2 = (4/7)*n // - (4/7)*n
2-((4/7)*n) = 0
(-4/7)*n+2 = 0
2-4/7*n = 0 // - 2
-4/7*n = -2 // : -4/7
n = -2/(-4/7)
n = 7/2
n = 7/2
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