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8n(-5n+4)=8
We move all terms to the left:
8n(-5n+4)-(8)=0
We multiply parentheses
-40n^2+32n-8=0
a = -40; b = 32; c = -8;
Δ = b2-4ac
Δ = 322-4·(-40)·(-8)
Δ = -256
Delta is less than zero, so there is no solution for the equation
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