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-5c+10-7c=-10-10c
We move all terms to the left:
-5c+10-7c-(-10-10c)=0
We add all the numbers together, and all the variables
-5c-7c-(-10c-10)+10=0
We add all the numbers together, and all the variables
-12c-(-10c-10)+10=0
We get rid of parentheses
-12c+10c+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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