Verified Answer :

2x + 7y = 2(2x + 10y) - 5x   Use the Distributive Property
2x + 7y = 4x + 20y - 5x        Combine like terms (4x and -5x)
2x + 7y = 20y - x                  Add x to both sides
3x + 7y = 20y                       Subtract 7y from both sides
        3x = 13y                       Divide both sides by 13
        \(\frac{3x}{13}\) = y   Switch the sides to make it easier to read
        y = \(\frac{3x}{13}\)

First thing you'll do is add -20y to both sides...
2x+7y+−20y=−x+20y+−20y
2x−13y=−x
Next, add 
-2x to both sides...
2x−13y+−2x
=−x+−2x
−13y
=−3x
Lastly, divide both sides by -13...
−13y/−13=−3x/−13
Now, your answer is...
\(y= \frac{3}{13} x\)

Good luck with your studies, hope this helps~