exam Maths Puzzle Numerical Ability

How do I determine how to apply flow proofs to solving equations

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Subtgract5m+3n-2p from3m-3n+14p answer for one video club charges $25 to become a member and $2.50 to rent each video another charges no rental fee and $3.25 to rent each video how many videos must you rent to make the first club more economical