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n in (-oo:+oo)
10-n = 34-3*n // - 34-3*n
10-n-(-3*n)-34 = 0
3*n-n-34+10 = 0
2*n-24 = 0 // + 24
2*n = 24 // : 2
n = 24/2
n = 12
n = 12
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