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-3c+20=-10+7c
We move all terms to the left:
-3c+20-(-10+7c)=0
We add all the numbers together, and all the variables
-3c-(7c-10)+20=0
We get rid of parentheses
-3c-7c+10+20=0
We add all the numbers together, and all the variables
-10c+30=0
We move all terms containing c to the left, all other terms to the right
-10c=-30
c=-30/-10
c=+3
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