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n in (-oo:+oo)
2*n+2 = 7*n-58 // - 7*n-58
2*n-(7*n)+2+58 = 0
2*n-7*n+2+58 = 0
60-5*n = 0 // - 60
-5*n = -60 // : -5
n = -60/(-5)
n = 12
n = 12
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