Hey there!
3x + 13 = 3(x + 6) + 1
3x + 13 = 3(x) + 3(6) + 1
3x + 13 = 3x + 18 + 1
3x + 13 = 3x + 19
SUBTRACT 3x to BOTH SIDES
3x + 13 - 3x = 3x + 19 - 3x
SIMPLIFY IT!
13 = 19
SUBTRACT 13 to BOTH SIDES
13 - 13 = 19 - 13
SIMPLIFY IT!
0 = 6
Thus, this mean that you have NO SOLUTION.
Therefore, your answer is: Zero (Option A.)
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)