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n in (-oo:+oo)
5*n+7 = 67-7*n // - 67-7*n
5*n-(-7*n)-67+7 = 0
5*n+7*n-67+7 = 0
12*n-60 = 0 // + 60
12*n = 60 // : 12
n = 60/12
n = 5
n = 5
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