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-2(c+9)=-10
We move all terms to the left:
-2(c+9)-(-10)=0
We add all the numbers together, and all the variables
-2(c+9)+10=0
We multiply parentheses
-2c-18+10=0
We add all the numbers together, and all the variables
-2c-8=0
We move all terms containing c to the left, all other terms to the right
-2c=8
c=8/-2
c=-4
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