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Philip has twice as many salamanders as Matt. If Philip gives Matt 10 of his salamanders, he will have half as many as Matt. How many each has?
Here, the first eq is P=2M. Now, Kaplan
formulates the second equation as P-10 = 1/2(M+10).
My question is, why should the second eq not be P-10 = 1/2(M).