Question 21505
4(5n-7) = 10n+2  
First, remove parentheses.
20n-28 = 10n+2
Next, isolate the variable by adding -10n to both sides.
10n-28 = 2
Add 28 to both sides.
10n = 30
Divide both sides by 10.
n = 3


Did you follow all of that?