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If Crystal multiplies her age by 3 and then adds 2, she will get a number equal to her mother’s age. If m is her mother’s age, what is Crystal’s age in terms of m?

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Cheahjimmyviz
let C =  Crystal's age
   thus          3C + 2  =   m
                        3C  =      m -2
                           C  =    (m -2)/3