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n in (-oo:+oo)
(3*n)/4 = -6/5 // + -6/5
(3*n)/4-(-6/5) = 0
(3*n)/4+6/5 = 0
3/4*n+6/5 = 0 // - 6/5
3/4*n = -6/5 // : 3/4
n = -6/5/3/4
n = -8/5
n = -8/5
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