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45=9c-87
We move all terms to the left:
45-(9c-87)=0
We get rid of parentheses
-9c+87+45=0
We add all the numbers together, and all the variables
-9c+132=0
We move all terms containing c to the left, all other terms to the right
-9c=-132
c=-132/-9
c=14+2/3
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