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-2x(x+1)=6
We move all terms to the left:
-2x(x+1)-(6)=0
We multiply parentheses
-2x^2-2x-6=0
a = -2; b = -2; c = -6;
Δ = b2-4ac
Δ = -22-4·(-2)·(-6)
Δ = -44
Delta is less than zero, so there is no solution for the equation
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