CXC math past paper question Functions (2018 to 2021)- January and May/June

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30:30
How did you get x=21
I got ×=20/3
Why?

1/3x-1/3x that cancel leave 7
Then 7-1/3 = put 7 over 1 and then take it away from 1/3 and leave with 20/3




Can you explain how you get 21 please and thanks? Or I.did something wrong

tantanwilson