x-8=3/4x-7

Solution for x-8=3/4x-7 equation:

x-8=3/4x-7

We move all terms to the left:

x-8-(3/4x-7)=0


Domain of the equation: 4x-7)!=0

x∈R


We get rid of parentheses

x-3/4x+7-8=0

We multiply all the terms by the denominator


x*4x+7*4x-8*4x-3=0

Wy multiply elements

4x^2+28x-32x-3=0

We add all the numbers together, and all the variables

4x^2-4x-3=0

a = 4; b = -4; c = -3;
Δ = b2-4ac
Δ = -42-4·4·(-3)
Δ = 64
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{64}=8$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-8}{2*4}=\frac{-4}{8}
=-1/2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+8}{2*4}=\frac{12}{8}
=1+1/2
$