c-7=18-21

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Solution for c-7=18-21 equation: 



c-7=18-21

We move all terms to the left:

c-7-(18-21)=0

We add all the numbers together, and all the variables

c-7-(-3)=0

We add all the numbers together, and all the variables

c-4=0

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

c=4

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