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9(c-10)=-99
We move all terms to the left:
9(c-10)-(-99)=0
We add all the numbers together, and all the variables
9(c-10)+99=0
We multiply parentheses
9c-90+99=0
We add all the numbers together, and all the variables
9c+9=0
We move all terms containing c to the left, all other terms to the right
9c=-9
c=-9/9
c=-1
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