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21+3c=-4+28
We move all terms to the left:
21+3c-(-4+28)=0
We add all the numbers together, and all the variables
3c+21-24=0
We add all the numbers together, and all the variables
3c-3=0
We move all terms containing c to the left, all other terms to the right
3c=3
c=3/3
c=1
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