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