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x^2+66=14x+15
We move all terms to the left:
x^2+66-(14x+15)=0
We get rid of parentheses
x^2-14x-15+66=0
We add all the numbers together, and all the variables
x^2-14x+51=0
a = 1; b = -14; c = +51;
Δ = b2-4ac
Δ = -142-4·1·51
Δ = -8
Delta is less than zero, so there is no solution for the equation
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