Hey there!
x + 8 = 19
SUBTRACT 8 to BOTH SIDES
x + 8 - 8 = 19 - 8
CANCEL out: 8 - 8 because it give you 0
KEEP: 19 - 8 because it give you the x-value
NEW EQUATION: x = 19 - 8
SIMPLIFY IT!
x = 11
Therefore, your answer is:
x = 11 (Option A)
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)