y*2y*7=14y

Solution for y*2y*7=14y equation:

y*2y*7=14y

We move all terms to the left:

y*2y*7-(14y)=0

We add all the numbers together, and all the variables

-14y+y*2y*7=0

Wy multiply elements

14y^2*7-14y=0

Wy multiply elements

98y^2-14y=0

a = 98; b = -14; c = 0;
Δ = b2-4ac
Δ = -142-4·98·0
Δ = 196
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{196}=14$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-14)-14}{2*98}=\frac{0}{196}
=0
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-14)+14}{2*98}=\frac{28}{196}
=1/7
$