2/5x-1=3/10x-+7

Solution for 2/5x-1=3/10x-+7 equation:

2/5x-1=3/10x-+7

We move all terms to the left:

2/5x-1-(3/10x-+7)=0


Domain of the equation: 5x!=0

x!=0/5

x!=0

x∈R



Domain of the equation: 10x-+7)!=0

x∈R


We add all the numbers together, and all the variables

2/5x-(+3/10x)-1=0

We get rid of parentheses

2/5x-3/10x-1=0

We calculate fractions


20x/50x^2+(-15x)/50x^2-1=0

We multiply all the terms by the denominator


20x+(-15x)-1*50x^2=0

Wy multiply elements

-50x^2+20x+(-15x)=0

We get rid of parentheses

-50x^2+20x-15x=0

We add all the numbers together, and all the variables

-50x^2+5x=0

a = -50; b = 5; c = 0;
Δ = b2-4ac
Δ = 52-4·(-50)·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*-50}=\frac{-10}{-100}
=1/10
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5}{2*-50}=\frac{0}{-100}
=0
$