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-6(-7-c)=90
We move all terms to the left:
-6(-7-c)-(90)=0
We add all the numbers together, and all the variables
-6(-1c-7)-90=0
We multiply parentheses
6c+42-90=0
We add all the numbers together, and all the variables
6c-48=0
We move all terms containing c to the left, all other terms to the right
6c=48
c=48/6
c=8
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