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n in (-oo:+oo)
(3*n)/7+3 = (2*n)/10-5 // - (2*n)/10-5
(3*n)/7-((2*n)/10)+3+5 = 0
(3*n)/7+(-1/5)*n+3+5 = 0
8/35*n+8 = 0 // - 8
8/35*n = -8 // : 8/35
n = -8/8/35
n = -35
n = -35
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