-3x - 9 = -21
-3x = -21 + 9
-3x = -12
x = -12 / -3
The equation -3z -9 = 21 is solve as follows. Supply the correct numbers to complete the solution.
-3x -9 = -21
-3x = _____ add 9 to both sides
x = _____ divide both sides by -3
1 answer