SOLUTION: i dont understand problems like this 9a-5c=15c solve for c

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Question 675485: i dont understand problems like this
9a-5c=15c solve for c
Found 2 solutions by jim_thompson5910, stanbon:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
9a-5c=15c Start with the given equation.


-5c=15c-9a Subtract 9a from both sides.


-5c-15c=-9a Subtract 15c from both sides.


-20c=-9a Combine like terms on the left side.


c=%28-9a%29%2F%28-20%29 Divide both sides by -20 to isolate c.


c=%289a%29%2F%2820%29 Reduce.


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Answer:

So the solution is c=%289a%29%2F%2820%29

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
9a-5c=15c solve for c
Add 5c to both sides to get:
20c = 9a
Divide both sides by 20:
c = (9/20)a
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Cheers,
Stan H.