Answer :
3x + 65 = 7x + 13
Here's one way:
Subtract 3x from each side: 65 = 4x + 13
Subtract 13 from each side: 52 = 4x
Divide each side by 4 : 13 = x
Here's one way:
Subtract 3x from each side: 65 = 4x + 13
Subtract 13 from each side: 52 = 4x
Divide each side by 4 : 13 = x