I have 25 coins, x of them are R5 coins and the rest are R2 coins. An expression in term in terms of x for
the number of R2 coins I have is. . .
There are 2 sets of coins R5 and R2. The number of coins should add up to 25.
x+yR2=25
yR2=25-x
The number of R2 coins I have is 25-x
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