Math Question
![A bag has some red marbles and some blue marbles in it. This can be modeled with the following equation.
\[
T=r+b
\]
Solve the equation for the number of blue marbles, \( b \).
Enter the variable that belongs in the green box.
\[
b=[?]-[]
\]](https://d3hlidq5bf9vg0.cloudfront.net/app-server-student/2022/4/13/25997a8c-05ea-44e8-942f-7e005eb38ae6.png "A bag has some red marbles and some blue marbles in it. This can be modeled with the following equation.
\[
T=r+b
\]
Solve the equation for the number of blue marbles, \( b \).
Enter the variable that belongs in the green box.
\[
b=[?]-[]
\]")
Solution
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