Find x. geometry math question no guessing and show work

I hope this helps and I tried to show my working as much as possible. Feel free to ask if you can't understand.

edit: this means the answer is B

Do the math. she originally had 50 dollars on her gift card and she had 12 dollars left on her gift card after she finished her shopping spree. if you subtract 50 minus 12 you get thirty eight dollars as your answer. so therefore, ciara spent 38 dollars total o