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Y=8/9+x input of 19 and output of 19

Y=8/9+x input of 19 and output of 19-example-1

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Explanation:

input is x

output is y

replace y with output value:

19 = 8/9 + x

19-8/9 = x

171/9 - 8/9 = x

x = 163/9

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