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