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180=3c+90
We move all terms to the left:
180-(3c+90)=0
We get rid of parentheses
-3c-90+180=0
We add all the numbers together, and all the variables
-3c+90=0
We move all terms containing c to the left, all other terms to the right
-3c=-90
c=-90/-3
c=+30
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