(((x^2)-5+4x-7)/3)+6=9

Solution for (((x^2)-5+4x-7)/3)+6=9 equation:

(((x^2)-5+4x-7)/3)+6=9

We move all terms to the left:

(((x^2)-5+4x-7)/3)+6-(9)=0

We add all the numbers together, and all the variables

((x^2-5+4x-7)/3)-3=0

We multiply all the terms by the denominator


((x^2-5+4x-7)-3*3)=0


We calculate terms in parentheses: +((x^2-5+4x-7)-3*3), so:

(x^2-5+4x-7)-3*3

We add all the numbers together, and all the variables

(x^2-5+4x-7)-9

We get rid of parentheses

x^2+4x-5-7-9

We add all the numbers together, and all the variables

x^2+4x-21

Back to the equation:

+(x^2+4x-21)


We get rid of parentheses

x^2+4x-21=0

a = 1; b = 4; c = -21;
Δ = b2-4ac
Δ = 42-4·1·(-21)
Δ = 100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{100}=10$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-10}{2*1}=\frac{-14}{2}
=-7
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+10}{2*1}=\frac{6}{2}
=3
$