Answer:
Yan has 12 marbles and Geraldo has 9
Explanation:
Because 12 + 9 =21 and 9 is 3 less than 12.
Step-by-step explanation:
X = number of Yan's marbles. x-3 = number of Geraldo's marbles
annswer: x + (x - 3) = 21
hopes this helps :)
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