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n in (-oo:+oo)
5 = (5*(4*n-5))/3 // - (5*(4*n-5))/3
5-((5*(4*n-5))/3) = 0
(-5/3)*(4*n-5)+5 = 0
5-5/3*(4*n-5) = 0
5-5/3*(4*n-5) = 0
40/3-20/3*n = 0
40/3-20/3*n = 0
40/3-20/3*n = 0 // - 40/3
-20/3*n = -40/3 // : -20/3
n = -40/3/(-20/3)
n = 2
n = 2
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