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x2-5.2x+7.8=0
We add all the numbers together, and all the variables
x^2-5.2x+7.8=0
a = 1; b = -5.2; c = +7.8;
Δ = b2-4ac
Δ = -5.22-4·1·7.8
Δ = -4.16
Delta is less than zero, so there is no solution for the equation
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