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n in (-oo:+oo)
(2/3)*n+1/5 = -7/15 // + -7/15
(2/3)*n+1/5-(-7/15) = 0
(2/3)*n+1/5+7/15 = 0
2/3*n+2/3 = 0 // - 2/3
2/3*n = -2/3 // : 2/3
n = -2/3/2/3
n = -1
n = -1
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