x+3(x*1/3)=25

Solution for x+3(x*1/3)=25 equation:

x+3(x*1/3)=25

We move all terms to the left:

x+3(x*1/3)-(25)=0

We add all the numbers together, and all the variables

x+3(+x*1/3)-25=0

We multiply parentheses

3x^2+x-25=0

a = 3; b = 1; c = -25;
Δ = b2-4ac
Δ = 12-4·3·(-25)
Δ = 301
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{-(1)-\sqrt{301}}{2*3}=\frac{-1-\sqrt{301}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{301}}{2*3}=\frac{-1+\sqrt{301}}{6}
$