(10/21)*2y=20

Solution for (10/21)*2y=20 equation:

(10/21)*2y=20

We move all terms to the left:

(10/21)*2y-(20)=0


Domain of the equation: 21)*2y!=0

y!=0/1

y!=0

y∈R


We add all the numbers together, and all the variables

(+10/21)*2y-20=0

We multiply parentheses

20y^2-20=0

a = 20; b = 0; c = -20;
Δ = b2-4ac
Δ = 02-4·20·(-20)
Δ = 1600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1600}=40$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-40}{2*20}=\frac{-40}{40}
=-1
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+40}{2*20}=\frac{40}{40}
=1
$