(1/3)(6x-12)+5x=17

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Solution for (1/3)(6x-12)+5x=17 equation:



(1/3)(6x-12)+5x=17
We move all terms to the left:
(1/3)(6x-12)+5x-(17)=0
Domain of the equation: 3)(6x-12)!=0
x∈R
We add all the numbers together, and all the variables
(+1/3)(6x-12)+5x-17=0
We add all the numbers together, and all the variables
5x+(+1/3)(6x-12)-17=0
We multiply parentheses ..
(+6x^2+1/3*-12)+5x-17=0
We multiply all the terms by the denominator
(+6x^2+1+5x*3*-12)-17*3*-12)=0
We add all the numbers together, and all the variables
(+6x^2+1+5x*3*-12)=0
We get rid of parentheses
6x^2+5x*3*+1-12=0
We add all the numbers together, and all the variables
6x^2+5x*3*-11=0
Wy multiply elements
6x^2+15x^2-11=0
We add all the numbers together, and all the variables
21x^2-11=0
a = 21; b = 0; c = -11;
Δ = b2-4ac
Δ = 02-4·21·(-11)
Δ = 924
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:
$\sqrt{\Delta}=\sqrt{924}=\sqrt{4*231}=\sqrt{4}*\sqrt{231}=2\sqrt{231}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{231}}{2*21}=\frac{0-2\sqrt{231}}{42} =-\frac{2\sqrt{231}}{42} =-\frac{\sqrt{231}}{21} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{231}}{2*21}=\frac{0+2\sqrt{231}}{42} =\frac{2\sqrt{231}}{42} =\frac{\sqrt{231}}{21} $

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