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n in (-oo:+oo)
7*n+6 = 87-2*n // - 87-2*n
7*n-(-2*n)-87+6 = 0
7*n+2*n-87+6 = 0
9*n-81 = 0 // + 81
9*n = 81 // : 9
n = 81/9
n = 9
n = 9
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