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7-4(c-7)=80
We move all terms to the left:
7-4(c-7)-(80)=0
We add all the numbers together, and all the variables
-4(c-7)-73=0
We multiply parentheses
-4c+28-73=0
We add all the numbers together, and all the variables
-4c-45=0
We move all terms containing c to the left, all other terms to the right
-4c=45
c=45/-4
c=-11+1/4
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