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n in (-oo:+oo)
3-((4*n)/7) = 6 // - 6
3-((4*n)/7)-6 = 0
(-4/7)*n-6+3 = 0
-4/7*n-3 = 0 // + 3
-4/7*n = 3 // : -4/7
n = 3/(-4/7)
n = -21/4
n = -21/4
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