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7(5c-9)=20
We move all terms to the left:
7(5c-9)-(20)=0
We multiply parentheses
35c-63-20=0
We add all the numbers together, and all the variables
35c-83=0
We move all terms containing c to the left, all other terms to the right
35c=83
c=83/35
c=2+13/35
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