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x^2-7x+73-(x-7)=0
We get rid of parentheses
x^2-7x-x+7+73=0
We add all the numbers together, and all the variables
x^2-8x+80=0
a = 1; b = -8; c = +80;
Δ = b2-4ac
Δ = -82-4·1·80
Δ = -256
Delta is less than zero, so there is no solution for the equation
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