Which of the following is the solution to -12 + r = 3
-12 + r = 3 r = 3 + 12r= 15
Add 12 to both sides to get your answer.
The value of r is 15. To get this, put the like terms together by crossing -12 over the equal sign. Once on the other side, the negative sign will change to positive. So to get the value of r, you add 12+3=15.