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7x=5x^2+4
We move all terms to the left:
7x-(5x^2+4)=0
We get rid of parentheses
-5x^2+7x-4=0
a = -5; b = 7; c = -4;
Δ = b2-4ac
Δ = 72-4·(-5)·(-4)
Δ = -31
Delta is less than zero, so there is no solution for the equation
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