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(7/3)=21c
We move all terms to the left:
(7/3)-(21c)=0
We add all the numbers together, and all the variables
-21c+(+7/3)=0
We get rid of parentheses
-21c+7/3=0
We multiply all the terms by the denominator
-21c*3+7=0
Wy multiply elements
-63c+7=0
We move all terms containing c to the left, all other terms to the right
-63c=-7
c=-7/-63
c=1/9
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