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

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

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

We move all terms to the left:

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


Domain of the equation: 2x!=0

x!=0/2

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

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

We calculate fractions


5x/10x^2+(-4x)/10x^2+2=0

We multiply all the terms by the denominator


5x+(-4x)+2*10x^2=0

Wy multiply elements

20x^2+5x+(-4x)=0

We get rid of parentheses

20x^2+5x-4x=0

We add all the numbers together, and all the variables

20x^2+x=0

a = 20; b = 1; c = 0;
Δ = b2-4ac
Δ = 12-4·20·0
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1}=1$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-1}{2*20}=\frac{-2}{40}
=-1/20
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+1}{2*20}=\frac{0}{40}
=0
$