The equation -3x -9 = -21 is solved as follows. Supply the correct numbers to complete the solution.
Options:
-3x -9 = -21
-3x = ____ add 9 to both sides
x = ______ divide both sides by -3
-3x -9 = -21
-3x = -21 + 9 (add 9 to both sides)
-3x = -12
x = -12 / -3 (divide both sides by -3)
The correct numbers to complete the solution are:
-21 + 9 = -12
-12 / -3 = 4