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30=-c+45
We move all terms to the left:
30-(-c+45)=0
We add all the numbers together, and all the variables
-(-1c+45)+30=0
We get rid of parentheses
1c-45+30=0
We add all the numbers together, and all the variables
c-15=0
We move all terms containing c to the left, all other terms to the right
c=15
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