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x^2=7x-13
We move all terms to the left:
x^2-(7x-13)=0
We get rid of parentheses
x^2-7x+13=0
a = 1; b = -7; c = +13;
Δ = b2-4ac
Δ = -72-4·1·13
Δ = -3
Delta is less than zero, so there is no solution for the equation
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