When 2/3 is added to a certain number, the sum is 3 greater than twice the number. part 1: set up an equation using n to represent the number. part 2: solve the equation in part 1 for n.?

2/3 + n = 2n + 3 <== ur equation
2/3 - 3 = 2n - n
2/3 - 9/3 = n
-7/3 = n <== ur solution

or
2/3 + n = 2n + 3...multiply everything by common denominator of 3
2 + 3n = 6n + 9
2 - 9 = 6n - 3n
-7 = 3n
-7/3 = n