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78=15+2c
We move all terms to the left:
78-(15+2c)=0
We add all the numbers together, and all the variables
-(2c+15)+78=0
We get rid of parentheses
-2c-15+78=0
We add all the numbers together, and all the variables
-2c+63=0
We move all terms containing c to the left, all other terms to the right
-2c=-63
c=-63/-2
c=31+1/2
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