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n in (-oo:+oo)
(4*n)/7+(3*n)/2 = -3 // + 3
(4*n)/7+(3*n)/2+3 = 0
29/14*n+3 = 0 // - 3
29/14*n = -3 // : 29/14
n = -3/29/14
n = -42/29
n = -42/29
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