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-9(c-2)=90
We move all terms to the left:
-9(c-2)-(90)=0
We multiply parentheses
-9c+18-90=0
We add all the numbers together, and all the variables
-9c-72=0
We move all terms containing c to the left, all other terms to the right
-9c=72
c=72/-9
c=-8
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