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n in (-oo:+oo)
(1/4)*n = (3*(2/9))/5 // - (3*(2/9))/5
(1/4)*n-((3*(2/9))/5) = 0
(1/4)*n-2/15 = 0
1/4*n-2/15 = 0 // + 2/15
1/4*n = 2/15 // : 1/4
n = 2/15/1/4
n = 8/15
n = 8/15
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