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n in (-oo:+oo)
2-5*n = 2*n+72 // - 2*n+72
2-5*n-(2*n)-72 = 0
2-5*n-2*n-72 = 0
-7*n-70 = 0 // + 70
-7*n = 70 // : -7
n = 70/(-7)
n = -10
n = -10
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