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n in (-oo:+oo)
3/10-(2*n) = -6/5 // + -6/5
3/10-(2*n)-(-6/5) = 0
3/10-2*n+6/5 = 0
3/2-2*n = 0 // - 3/2
-2*n = -3/2 // : -2
n = -3/2/(-2)
n = 3/4
n = 3/4
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