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-9c+-2=-20-7c
We move all terms to the left:
-9c+-2-(-20-7c)=0
We add all the numbers together, and all the variables
-9c-(-7c-20)-2+=0
We add all the numbers together, and all the variables
-9c-(-7c-20)=0
We get rid of parentheses
-9c+7c+20=0
We add all the numbers together, and all the variables
-2c+20=0
We move all terms containing c to the left, all other terms to the right
-2c=-20
c=-20/-2
c=+10
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