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n in (-oo:+oo)
n/4-((9*n)/14) = 1/7 // - 1/7
n/4-((9*n)/14)-(1/7) = 0
n/4+(-9/14)*n-1/7 = 0
-11/28*n-1/7 = 0 // + 1/7
-11/28*n = 1/7 // : -11/28
n = 1/7/(-11/28)
n = -4/11
n = -4/11
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