Question 342217
4(5n-7)=10n+2

20n - 28 = 10n + 2

20n - 10n = 28 + 2

10n = 30

n = 30/10

n = 3

The Proof:

Let n = 3

4(5(3)-7)= 10(3)+ 2

4(15 - 7) = 30 + 2

4(8) = 32

32 = 32

This proofs that n = 3 is correct.