7c-9=10c+9

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Solution for 7c-9=10c+9 equation: 



7c-9=10c+9

We move all terms to the left:

7c-9-(10c+9)=0

We get rid of parentheses

7c-10c-9-9=0

We add all the numbers together, and all the variables

-3c-18=0

We move all terms containing c to the left, all other terms to the right

-3c=18

c=18/-3

c=-6

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