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n in (-oo:+oo)
1/4-3*n = (5/7)*n-(187/84) // - (5/7)*n-(187/84)
1/4-3*n-((5/7)*n)+187/84 = 0
(-5/7)*n-3*n+1/4+187/84 = 0
52/21-26/7*n = 0 // - 52/21
-26/7*n = -52/21 // : -26/7
n = -52/21/(-26/7)
n = 2/3
n = 2/3
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