15=13.80+.8c

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Solution for 15=13.80+.8c equation: 



15=13.80+.8c

We move all terms to the left:

15-(13.80+.8c)=0

We add all the numbers together, and all the variables

-(.8c+13.8)+15=0

We get rid of parentheses

-.8c-13.8+15=0

We add all the numbers together, and all the variables

-0.8c+1.2=0

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

-0.8c=-1.2

c=-1.2/-0.8

c=1+0.4/0.8

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