<PRE><B>Question 818792</B>
(f + 3) = 3(r + 3)
f = r + 12
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(f + 3) = 3(r + 3)
f + 3 = 3r + 9
r + 12 + 3 = 3r + 9
2r = 15 - 9
2r = 6
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r = 3
f = 15
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