Tillie is solving an equation for x. Her first step is to subtract 8 from both sides of the equation. Which equation is she solving?
A. 12 - x = - 8
B. 12 = - x + 8
C. 12 - x = 8
D. 12 = - x - 8
A. 12 - x = - 8
B. 12 = - x + 8
C. 12 - x = 8
D. 12 = - x - 8