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4x-2x^2=7
We move all terms to the left:
4x-2x^2-(7)=0
a = -2; b = 4; c = -7;
Δ = b2-4ac
Δ = 42-4·(-2)·(-7)
Δ = -40
Delta is less than zero, so there is no solution for the equation
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