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3c+30=5c+210
We move all terms to the left:
3c+30-(5c+210)=0
We get rid of parentheses
3c-5c-210+30=0
We add all the numbers together, and all the variables
-2c-180=0
We move all terms containing c to the left, all other terms to the right
-2c=180
c=180/-2
c=-90
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