Question

13 add 2x equals 3 what does x equal??

Answer 1

13 + 2x = 3
subtract 13 from both sides of the equation
2x = -10
divide by 2 on both sides 
x = -5

Answer 2

13 + 2x = 3  First, we subtract 13 from each side.
2x = -10  Then, we divide each side by 2.
x = -5  There is our answer!