Answer:
2x/5 = 6
x 5 x 5
2x = 30
divide by 2 on both sides
x = 15
I think it is 40x16=640
Answer = 64:0
What you have written here is an equation.
You can define as
a2+b2=y
If you want to derive a^2+b^2 from ( a+b)^2
(a+b)2=a2+b2+2ab
Ora2+b2=(a+b)2−2ab