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-7=2c+5
We move all terms to the left:
-7-(2c+5)=0
We get rid of parentheses
-2c-5-7=0
We add all the numbers together, and all the variables
-2c-12=0
We move all terms containing c to the left, all other terms to the right
-2c=12
c=12/-2
c=-6
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