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