SOLUTION: {{{d=(r-6)3}}} {{{d=(r+6)2}}}

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Question 201626: d=%28r-6%293
d=%28r%2B6%292
Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
(1) d= (r-6)3
(2) d= (r+6)2
.
3(r-6) = 2(r+6)
3r-18 = 2r +12
r=30
.
check,,d = (30-6)3 =24 *3 = 72
d= (30 +6) 2 = 36 *2 = 72,,,,ok