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79=10c+40
We move all terms to the left:
79-(10c+40)=0
We get rid of parentheses
-10c-40+79=0
We add all the numbers together, and all the variables
-10c+39=0
We move all terms containing c to the left, all other terms to the right
-10c=-39
c=-39/-10
c=3+9/10
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