2/3x-1/5x=-1

Solution for 2/3x-1/5x=-1 equation:

2/3x-1/5x=-1

We move all terms to the left:

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


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R



Domain of the equation: 5x!=0

x!=0/5

x!=0

x∈R


We add all the numbers together, and all the variables

2/3x-1/5x+1=0

We calculate fractions


10x/15x^2+(-3x)/15x^2+1=0

We multiply all the terms by the denominator


10x+(-3x)+1*15x^2=0

Wy multiply elements

15x^2+10x+(-3x)=0

We get rid of parentheses

15x^2+10x-3x=0

We add all the numbers together, and all the variables

15x^2+7x=0

a = 15; b = 7; c = 0;
Δ = b2-4ac
Δ = 72-4·15·0
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{49}=7$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-7}{2*15}=\frac{-14}{30}
=-7/15
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+7}{2*15}=\frac{0}{30}
=0
$