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c/9-50=-40
We move all terms to the left:
c/9-50-(-40)=0
We add all the numbers together, and all the variables
c/9-10=0
We multiply all the terms by the denominator
c-10*9=0
We add all the numbers together, and all the variables
c-90=0
We move all terms containing c to the left, all other terms to the right
c=90
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