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n in (-oo:+oo)
4*n-(1/2) = 139/2-(3*n) // - 139/2-(3*n)
4*n+3*n-(1/2)-(139/2) = 0
4*n+3*n-1/2-139/2 = 0
7*n-70 = 0 // + 70
7*n = 70 // : 7
n = 70/7
n = 10
n = 10
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