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40=c+30.98
We move all terms to the left:
40-(c+30.98)=0
We get rid of parentheses
-c-30.98+40=0
We add all the numbers together, and all the variables
-1c+9.02=0
We move all terms containing c to the left, all other terms to the right
-c=-9.02
c=-9.02/-1
c=9+0.02/1
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