The correct equation is:
x + (x - 3) = 21, where x is the number of marbles Geraldo has
This equation represents the situation where Geraldo has 3 fewer marbles than Yan, and together they have a total of 21 marbles.
Geraldo has 3 fewer marbles than Yan. Together, they have 21 marbles. Which equation represents this situation?
x + (3 - x) = 21, where x is the number of marbles Geraldo has
x + (x - 3) = 21, where x is the number of marbles Geraldo has
x + (3 - x) = 21, where x is the number of marbles Yan has
x + (x - 3) = 21, where x if the number of marbles Yan has
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