1/2x+1/3x+5=90

Solution for 1/2x+1/3x+5=90 equation:

1/2x+1/3x+5=90

We move all terms to the left:

1/2x+1/3x+5-(90)=0


Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R



Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R


We add all the numbers together, and all the variables

1/2x+1/3x-85=0

We calculate fractions


3x/6x^2+2x/6x^2-85=0

We multiply all the terms by the denominator


3x+2x-85*6x^2=0

We add all the numbers together, and all the variables

5x-85*6x^2=0

Wy multiply elements

-510x^2+5x=0

a = -510; b = 5; c = 0;
Δ = b2-4ac
Δ = 52-4·(-510)·0
Δ = 25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{25}=5$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-5}{2*-510}=\frac{-10}{-1020}
=1/102
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5}{2*-510}=\frac{0}{-1020}
=0
$