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n in (-oo:+oo)
4-((6/7)*n)-(3*n) = 271/7 // - 271/7
4-((6/7)*n)-(3*n)-(271/7) = 0
(-6/7)*n-3*n-271/7+4 = 0
-27/7*n-243/7 = 0 // + 243/7
-27/7*n = 243/7 // : -27/7
n = 243/7/(-27/7)
n = -9
n = -9
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