21*3c=-4c+28

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Solution for 21*3c=-4c+28 equation: 



21*3c=-4c+28

We move all terms to the left:

21*3c-(-4c+28)=0

Wy multiply elements

63c-(-4c+28)=0

We get rid of parentheses

63c+4c-28=0

We add all the numbers together, and all the variables

67c-28=0

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

67c=28

c=28/67

c=28/67

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