2/3x-10+x=90

Solution for 2/3x-10+x=90 equation:

2/3x-10+x=90

We move all terms to the left:

2/3x-10+x-(90)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R


We add all the numbers together, and all the variables

x+2/3x-100=0

We multiply all the terms by the denominator


x*3x-100*3x+2=0

Wy multiply elements

3x^2-300x+2=0

a = 3; b = -300; c = +2;
Δ = b2-4ac
Δ = -3002-4·3·2
Δ = 89976
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:

$\sqrt{\Delta}=\sqrt{89976}=\sqrt{4*22494}=\sqrt{4}*\sqrt{22494}=2\sqrt{22494}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-300)-2\sqrt{22494}}{2*3}=\frac{300-2\sqrt{22494}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-300)+2\sqrt{22494}}{2*3}=\frac{300+2\sqrt{22494}}{6}
$