Hey there!
-9 + x = -14
x - 9 = -14
ADD 9 to BOTH SIDES
x - 9 + 9 = -14 + 9
CANCEL out: -9 + 9 because it give you 0
KEEP: -14 + 9 because it help solve for the x-value
NEW EQUATION: x = -14 + 9
SIMPLIFY IT!
x = -5
Therefore, your answer is: x = -5
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)