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45=4c+13
We move all terms to the left:
45-(4c+13)=0
We get rid of parentheses
-4c-13+45=0
We add all the numbers together, and all the variables
-4c+32=0
We move all terms containing c to the left, all other terms to the right
-4c=-32
c=-32/-4
c=+8
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