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n in (-oo:+oo)
(-6/7)*n+3 = 69/7 // - 69/7
(-6/7)*n-(69/7)+3 = 0
(-6/7)*n-69/7+3 = 0
-6/7*n-48/7 = 0 // + 48/7
-6/7*n = 48/7 // : -6/7
n = 48/7/(-6/7)
n = -8
n = -8
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