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21+0.25(61)=c
We move all terms to the left:
21+0.25(61)-(c)=0
We add all the numbers together, and all the variables
-1c+21.2561=0
We move all terms containing c to the left, all other terms to the right
-c=-21.2561
c=-21.2561/-1
c=21+0.2561/1
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