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19=4+5c
We move all terms to the left:
19-(4+5c)=0
We add all the numbers together, and all the variables
-(5c+4)+19=0
We get rid of parentheses
-5c-4+19=0
We add all the numbers together, and all the variables
-5c+15=0
We move all terms containing c to the left, all other terms to the right
-5c=-15
c=-15/-5
c=+3
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