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n in (-oo:+oo)
1/4-((4/7)*n) = -11/84 // + -11/84
1/4-((4/7)*n)-(-11/84) = 0
(-4/7)*n+1/4+11/84 = 0
8/21-4/7*n = 0 // - 8/21
-4/7*n = -8/21 // : -4/7
n = -8/21/(-4/7)
n = 2/3
n = 2/3
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