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n in (-oo:+oo)
-12 = -2*n-(7*n)-3 // + -2*n-(7*n)-3
7*n-(-2*n)-12+3 = 0
2*n+7*n-12+3 = 0
9*n-9 = 0 // + 9
9*n = 9 // : 9
n = 9/9
n = 1
n = 1
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