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n in (-oo:+oo)
10*n-((1/3)*(9*n-12)) = 0
(-1/3)*(9*n-12)+10*n = 0
10*n-1/3*(9*n-12) = 0
10*n-1/3*(9*n-12) = 0
7*n+4 = 0
7*n+4 = 0
7*n+4 = 0 // - 4
7*n = -4 // : 7
n = -4/7
n = -4/7
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