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x2-6x=-15
We move all terms to the left:
x2-6x-(-15)=0
We add all the numbers together, and all the variables
x^2-6x+15=0
a = 1; b = -6; c = +15;
Δ = b2-4ac
Δ = -62-4·1·15
Δ = -24
Delta is less than zero, so there is no solution for the equation
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