x-7/9x=40

Solution for x-7/9x=40 equation:

x-7/9x=40

We move all terms to the left:

x-7/9x-(40)=0


Domain of the equation: 9x!=0

x!=0/9

x!=0

x∈R


We multiply all the terms by the denominator


x*9x-40*9x-7=0

Wy multiply elements

9x^2-360x-7=0

a = 9; b = -360; c = -7;
Δ = b2-4ac
Δ = -3602-4·9·(-7)
Δ = 129852
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:

$\sqrt{\Delta}=\sqrt{129852}=\sqrt{36*3607}=\sqrt{36}*\sqrt{3607}=6\sqrt{3607}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-360)-6\sqrt{3607}}{2*9}=\frac{360-6\sqrt{3607}}{18}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-360)+6\sqrt{3607}}{2*9}=\frac{360+6\sqrt{3607}}{18}
$