7x-3/4x=25

Solution for 7x-3/4x=25 equation:

7x-3/4x=25

We move all terms to the left:

7x-3/4x-(25)=0


Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R


We multiply all the terms by the denominator


7x*4x-25*4x-3=0

Wy multiply elements

28x^2-100x-3=0

a = 28; b = -100; c = -3;
Δ = b2-4ac
Δ = -1002-4·28·(-3)
Δ = 10336
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{10336}=\sqrt{16*646}=\sqrt{16}*\sqrt{646}=4\sqrt{646}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-100)-4\sqrt{646}}{2*28}=\frac{100-4\sqrt{646}}{56}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-100)+4\sqrt{646}}{2*28}=\frac{100+4\sqrt{646}}{56}
$