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n in (-oo:+oo)
3-6*n-(7*n) = -62 // + 62
3-6*n-(7*n)+62 = 0
3-6*n-7*n+62 = 0
65-13*n = 0 // - 65
-13*n = -65 // : -13
n = -65/(-13)
n = 5
n = 5
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