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n in (-oo:+oo)
-29 = 7-7*n-(5*n) // - 7-7*n-(5*n)
5*n-(-7*n)-29-7 = 0
7*n+5*n-29-7 = 0
12*n-36 = 0 // + 36
12*n = 36 // : 12
n = 36/12
n = 3
n = 3
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