SOLUTION: Janet spent half of her weekly allowance playing mini-golf. To earn more money her parents let her wash the car for $9.What is her weekly allowance if she ended with $15 I need

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Question 1101303: Janet spent half of her weekly allowance playing mini-golf. To earn more money her parents let her wash the car for $9.What is her weekly allowance if she ended with $15
I need help setting it up I tried doing
X+9=15
But I don’t know if it’s correct
Answer by amalm06(224) About Me  (Show Source):
You can put this solution on YOUR website!
Let A=allowance
She spent half of her allowance: A-0.5A
But earned $9 and was left with $15 after spending and earning: A-0.5A+9=15
Solve for A:
0.5A+9=15
0.5A=6
A=$12 (Answer)