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(6x-3)(2x+13)=x
We move all terms to the left:
(6x-3)(2x+13)-(x)=0
We add all the numbers together, and all the variables
-1x+(6x-3)(2x+13)=0
We multiply parentheses ..
(+12x^2+78x-6x-39)-1x=0
We get rid of parentheses
12x^2+78x-6x-1x-39=0
We add all the numbers together, and all the variables
12x^2+71x-39=0
a = 12; b = 71; c = -39;
Δ = b2-4ac
Δ = 712-4·12·(-39)
Δ = 6913
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{-(71)-\sqrt{6913}}{2*12}=\frac{-71-\sqrt{6913}}{24} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(71)+\sqrt{6913}}{2*12}=\frac{-71+\sqrt{6913}}{24} $
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