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n in (-oo:+oo)
(4/7)*n-((1/3)*n)+10 = 35/3 // - 35/3
(4/7)*n-((1/3)*n)-(35/3)+10 = 0
(-1/3)*n+(4/7)*n-35/3+10 = 0
5/21*n-5/3 = 0 // + 5/3
5/21*n = 5/3 // : 5/21
n = 5/3/5/21
n = 7
n = 7
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