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915=c-403
We move all terms to the left:
915-(c-403)=0
We get rid of parentheses
-c+403+915=0
We add all the numbers together, and all the variables
-1c+1318=0
We move all terms containing c to the left, all other terms to the right
-c=-1318
c=-1318/-1
c=+1318
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