Answer:
The answer is 200
Step-by-step explanation:
It helps if you use the website math way, you punch in your equations and it gives you the answer instantly
im pretty sure the answer is 30
Hello!

Explanation:
↓↓↓↓↓↓↓↓↓↓
First you had to add by
from both sides of the equation.

Simplify it should be the correct answer.

Answer⇒⇒⇒⇒⇒r=2
Hope this helps!
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-Charlie