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n in (-oo:+oo)
7-(4*n)-(6*n) = -53 // + 53
7-(4*n)-(6*n)+53 = 0
7-4*n-6*n+53 = 0
60-10*n = 0 // - 60
-10*n = -60 // : -10
n = -60/(-10)
n = 6
n = 6
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