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97=6c+31
We move all terms to the left:
97-(6c+31)=0
We get rid of parentheses
-6c-31+97=0
We add all the numbers together, and all the variables
-6c+66=0
We move all terms containing c to the left, all other terms to the right
-6c=-66
c=-66/-6
c=+11
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