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c/9+-18=-20
We move all terms to the left:
c/9+-18-(-20)=0
We add all the numbers together, and all the variables
c/9+2=0
We multiply all the terms by the denominator
c+2*9=0
We add all the numbers together, and all the variables
c+18=0
We move all terms containing c to the left, all other terms to the right
c=-18
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