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n in (-oo:+oo)
2*(n+4) = (8/6)*(n-4) // - (8/6)*(n-4)
2*(n+4)-((8/6)*(n-4)) = 0
2*(n+4)+(-4/3)*(n-4) = 0
2*(n+4)-4/3*(n-4) = 0
2*(n+4)-4/3*(n-4) = 0
2/3*n+40/3 = 0
2/3*n+40/3 = 0
2/3*n+40/3 = 0 // - 40/3
2/3*n = -40/3 // : 2/3
n = -40/3/2/3
n = -20
n = -20
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