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n in (-oo:+oo)
4/7-((6/7)*n) = (3/4)*n+223/154 // - (3/4)*n+223/154
4/7-((6/7)*n)-((3/4)*n)-(223/154) = 0
(-6/7)*n+(-3/4)*n+4/7-223/154 = 0
-45/28*n-135/154 = 0 // + 135/154
-45/28*n = 135/154 // : -45/28
n = 135/154/(-45/28)
n = -6/11
n = -6/11
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