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n in (-oo:+oo)
3-3*n-(4*n) = 45 // - 45
3-3*n-(4*n)-45 = 0
3-3*n-4*n-45 = 0
-7*n-42 = 0 // + 42
-7*n = 42 // : -7
n = 42/(-7)
n = -6
n = -6
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