You can put this solution on YOUR website! (c/9)+(d/7)=5, Solve for d.
(7c + 9d)/63 = 5
7c + 9d = 315
9d = 315 - 7c
d = (315 - 7c)/9
or,
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C=(5/3)*enter pie sign here*g^4, Solve for g^4.
No math problems with pie.
Use the Greek letter pi.