N-3+N=15

Add N and N.

2N-3=15

Add 3 to both sides of the equation.

2N=15+3

Add 15 and 3.

2N=18

2N=18

Divide each term in 2N=18 by 2.

2N2=182

Cancel the common factor of 2.

Cancel the common factor.

2N2=182

Divide N by 1.

N=182

N=182

Divide 18 by 2.

N=9

N=9

Solve for N N-3+N=15