Hello! I'm having a problem figuring out this problem: 6c-9d=111 5c-9d=103

I've been looking at different ways to solve it, but I'm not sure how to do it. Please, help give me a step-by-step instruction on how to figure it out. (I'll make you the most Brainliest answer.) (And, you'll get a good amount of points.)

Answer :

Answer:

C=8

Step-by-step explanation:

   6c-9d=111

-) 5c-9d=103

   6c-5c=c

-9c+9c=0

111-103=8

(Negative+Negative=Positive)

          C=8

I need Brainliest!

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