x+2/3*x=87

Solution for x+2/3*x=87 equation:

x+2/3x=87

We move all terms to the left:

x+2/3x-(87)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R


We multiply all the terms by the denominator


x*3x-87*3x+2=0

Wy multiply elements

3x^2-261x+2=0

a = 3; b = -261; c = +2;
Δ = b2-4ac
Δ = -2612-4·3·2
Δ = 68097
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{-(-261)-\sqrt{68097}}{2*3}=\frac{261-\sqrt{68097}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-261)+\sqrt{68097}}{2*3}=\frac{261+\sqrt{68097}}{6}
$