21-4c=-15

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Solution for 21-4c=-15 equation: 



21-4c=-15

We move all terms to the left:

21-4c-(-15)=0

We add all the numbers together, and all the variables

-4c+36=0

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

-4c=-36

c=-36/-4

c=+9

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