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(459/47)*(51-x)-(9/47) = 0
(459/47)*(51-x)-9/47 = 0
459/47*(51-x)-9/47 = 0
(459/47*47*(51-x))/47-9/47 = 0
459/47*47*(51-x)-9 = 0
23400-459*x = 0
(23400-459*x)/47 = 0
(23400-459*x)/47 = 0 // * 47
23400-459*x = 0
23400-459*x = 0 // - 23400
-459*x = -23400 // : -459
x = -23400/(-459)
x = 2600/51
x = 2600/51
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