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7x^2-4=-23
We move all terms to the left:
7x^2-4-(-23)=0
We add all the numbers together, and all the variables
7x^2+19=0
a = 7; b = 0; c = +19;
Δ = b2-4ac
Δ = 02-4·7·19
Δ = -532
Delta is less than zero, so there is no solution for the equation
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