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(X+3)(X-6)=X-39=
We move all terms to the left:
(X+3)(X-6)-(X-39)=0
We get rid of parentheses
(X+3)(X-6)-X+39=0
We multiply parentheses ..
(+X^2-6X+3X-18)-X+39=0
We add all the numbers together, and all the variables
(+X^2-6X+3X-18)-1X+39=0
We get rid of parentheses
X^2-6X+3X-1X-18+39=0
We add all the numbers together, and all the variables
X^2-4X+21=0
a = 1; b = -4; c = +21;
Δ = b2-4ac
Δ = -42-4·1·21
Δ = -68
Delta is less than zero, so there is no solution for the equation
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