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n in (-oo:+oo)
3-7*n = (6/7)*n+76/7 // - (6/7)*n+76/7
3-7*n-((6/7)*n)-(76/7) = 0
(-6/7)*n-7*n-76/7+3 = 0
-55/7*n-55/7 = 0 // + 55/7
-55/7*n = 55/7 // : -55/7
n = 55/7/(-55/7)
n = -1
n = -1
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