12=4c-20.9

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Solution for 12=4c-20.9 equation: 



12=4c-20.9

We move all terms to the left:

12-(4c-20.9)=0

We get rid of parentheses

-4c+20.9+12=0

We add all the numbers together, and all the variables

-4c+32.9=0

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

-4c=-32.9

c=-32.9/-4

c=8+0.9/4

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