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n in (-oo:+oo)
10 = (4*n)/7 // - (4*n)/7
10-((4*n)/7) = 0
(-4/7)*n+10 = 0
10-4/7*n = 0 // - 10
-4/7*n = -10 // : -4/7
n = -10/(-4/7)
n = 35/2
n = 35/2
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