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7-32.

Mary has an antique marble collection containing marbles.  She has five more red marbles than blue and twice as many red as green marbles.  Write a system of equations to find the number of each color of marble.  Homework Help ✎

Let the number of blue marbles, the number of red marbles,
and the number of green marbles.

Solve the system of equations using a combination of substitution and elimination.