1/2(x)-2/3(x)=7

Solution for 1/2(x)-2/3(x)=7 equation:

1/2(x)-2/3(x)=7

We move all terms to the left:

1/2(x)-2/3(x)-(7)=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 calculate fractions


3x/6x^2+(-4x)/6x^2-7=0

We multiply all the terms by the denominator


3x+(-4x)-7*6x^2=0

Wy multiply elements

-42x^2+3x+(-4x)=0

We get rid of parentheses

-42x^2+3x-4x=0

We add all the numbers together, and all the variables

-42x^2-1x=0

a = -42; b = -1; c = 0;
Δ = b2-4ac
Δ = -12-4·(-42)·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*-42}=\frac{0}{-84}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+1}{2*-42}=\frac{2}{-84}
=-1/42
$