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25-4c=-9c
We move all terms to the left:
25-4c-(-9c)=0
We get rid of parentheses
-4c+9c+25=0
We add all the numbers together, and all the variables
5c+25=0
We move all terms containing c to the left, all other terms to the right
5c=-25
c=-25/5
c=-5
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