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(2n)(-3n-2)=3n-3
We move all terms to the left:
(2n)(-3n-2)-(3n-3)=0
We multiply parentheses
-6n^2-4n-(3n-3)=0
We get rid of parentheses
-6n^2-4n-3n+3=0
We add all the numbers together, and all the variables
-6n^2-7n+3=0
a = -6; b = -7; c = +3;
Δ = b2-4ac
Δ = -72-4·(-6)·3
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{121}=11$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-11}{2*-6}=\frac{-4}{-12} =1/3 $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+11}{2*-6}=\frac{18}{-12} =-1+1/2 $
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