1/7x-1/8x=2

Solution for 1/7x-1/8x=2 equation:

1/7x-1/8x=2

We move all terms to the left:

1/7x-1/8x-(2)=0


Domain of the equation: 7x!=0

x!=0/7

x!=0

x∈R



Domain of the equation: 8x!=0

x!=0/8

x!=0

x∈R


We calculate fractions


8x/56x^2+(-7x)/56x^2-2=0

We multiply all the terms by the denominator


8x+(-7x)-2*56x^2=0

Wy multiply elements

-112x^2+8x+(-7x)=0

We get rid of parentheses

-112x^2+8x-7x=0

We add all the numbers together, and all the variables

-112x^2+x=0

a = -112; b = 1; c = 0;
Δ = b2-4ac
Δ = 12-4·(-112)·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*-112}=\frac{-2}{-224}
=1/112
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+1}{2*-112}=\frac{0}{-224}
=0
$