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n in (-oo:+oo)
4 = (2*n)/7-10 // - (2*n)/7-10
4-((2*n)/7)+10 = 0
(-2/7)*n+4+10 = 0
14-2/7*n = 0 // - 14
-2/7*n = -14 // : -2/7
n = -14/(-2/7)
n = 49
n = 49
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