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20(c-50)=90000
We move all terms to the left:
20(c-50)-(90000)=0
We multiply parentheses
20c-1000-90000=0
We add all the numbers together, and all the variables
20c-91000=0
We move all terms containing c to the left, all other terms to the right
20c=91000
c=91000/20
c=4550
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