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87=23c+64
We move all terms to the left:
87-(23c+64)=0
We get rid of parentheses
-23c-64+87=0
We add all the numbers together, and all the variables
-23c+23=0
We move all terms containing c to the left, all other terms to the right
-23c=-23
c=-23/-23
c=1
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