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3-15-c=20+c
We move all terms to the left:
3-15-c-(20+c)=0
We add all the numbers together, and all the variables
-c-(c+20)+3-15=0
We add all the numbers together, and all the variables
-1c-(c+20)-12=0
We get rid of parentheses
-1c-c-20-12=0
We add all the numbers together, and all the variables
-2c-32=0
We move all terms containing c to the left, all other terms to the right
-2c=32
c=32/-2
c=-16
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