18.9=2.1c

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Solution for 18.9=2.1c equation: 



18.9=2.1c

We move all terms to the left:

18.9-(2.1c)=0

We add all the numbers together, and all the variables

-(+2.1c)+18.9=0

We get rid of parentheses

-2.1c+18.9=0

We move all terms containing c to the left, all other terms to the right

-2.1c=-18.9

c=-18.9/-2.1

c=8+1/1

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