3/4x-4+5/8x=3

Solution for 3/4x-4+5/8x=3 equation:

3/4x-4+5/8x=3

We move all terms to the left:

3/4x-4+5/8x-(3)=0


Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R



Domain of the equation: 8x!=0

x!=0/8

x!=0

x∈R


We add all the numbers together, and all the variables

3/4x+5/8x-7=0

We calculate fractions


24x/32x^2+20x/32x^2-7=0

We multiply all the terms by the denominator


24x+20x-7*32x^2=0

We add all the numbers together, and all the variables

44x-7*32x^2=0

Wy multiply elements

-224x^2+44x=0

a = -224; b = 44; c = 0;
Δ = b2-4ac
Δ = 442-4·(-224)·0
Δ = 1936
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1936}=44$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(44)-44}{2*-224}=\frac{-88}{-448}
=11/56
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(44)+44}{2*-224}=\frac{0}{-448}
=0
$