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/C=21-8
We move all terms to the left:
/C-(21-8)=0
Domain of the equation: C!=0We add all the numbers together, and all the variables
C∈R
/C-13=0
We multiply all the terms by the denominator
-13*C+=0
We add all the numbers together, and all the variables
-13C=0
C=0/-13
C=0
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