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2.1=0.7c
We move all terms to the left:
2.1-(0.7c)=0
We add all the numbers together, and all the variables
-(+0.7c)+2.1=0
We get rid of parentheses
-0.7c+2.1=0
We move all terms containing c to the left, all other terms to the right
-0.7c=-2.1
c=-2.1/-0.7
c=3+4.4408920985006E-16/0.7
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