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3x-(10x+7)-2x(2x-12x+1)+3=8x+3
We move all terms to the left:
3x-(10x+7)-2x(2x-12x+1)+3-(8x+3)=0
We add all the numbers together, and all the variables
3x-(10x+7)-2x(-10x+1)-(8x+3)+3=0
We multiply parentheses
20x^2+3x-(10x+7)-2x-(8x+3)+3=0
We get rid of parentheses
20x^2+3x-10x-2x-8x-7-3+3=0
We add all the numbers together, and all the variables
20x^2-17x-7=0
a = 20; b = -17; c = -7;
Δ = b2-4ac
Δ = -172-4·20·(-7)
Δ = 849
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-\sqrt{849}}{2*20}=\frac{17-\sqrt{849}}{40} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{849}}{2*20}=\frac{17+\sqrt{849}}{40} $
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