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7(c+9)=4
We move all terms to the left:
7(c+9)-(4)=0
We multiply parentheses
7c+63-4=0
We add all the numbers together, and all the variables
7c+59=0
We move all terms containing c to the left, all other terms to the right
7c=-59
c=-59/7
c=-8+3/7
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