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n in (-oo:+oo)
2-(5*n) = 2*n-75 // - 2*n-75
2-(5*n)-(2*n)+75 = 0
2-5*n-2*n+75 = 0
77-7*n = 0 // - 77
-7*n = -77 // : -7
n = -77/(-7)
n = 11
n = 11
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