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1/3x+4=12x-2
We move all terms to the left:
1/3x+4-(12x-2)=0
Domain of the equation: 3x!=0We get rid of parentheses
x!=0/3
x!=0
x∈R
1/3x-12x+2+4=0
We multiply all the terms by the denominator
-12x*3x+2*3x+4*3x+1=0
Wy multiply elements
-36x^2+6x+12x+1=0
We add all the numbers together, and all the variables
-36x^2+18x+1=0
a = -36; b = 18; c = +1;
Δ = b2-4ac
Δ = 182-4·(-36)·1
Δ = 468
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{468}=\sqrt{36*13}=\sqrt{36}*\sqrt{13}=6\sqrt{13}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(18)-6\sqrt{13}}{2*-36}=\frac{-18-6\sqrt{13}}{-72} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18)+6\sqrt{13}}{2*-36}=\frac{-18+6\sqrt{13}}{-72} $
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