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`9b + 3 = 7b + 11 || -7b `

`2b + 3 = 11 || -3 `

`2b = 8 || :2 `

`b = 4 || :2 `

Probe:

`9*4 + 3 = 7*4 + 11 `

`36 + 3 = 28 + 11 `

`39 = 39 ` ✔✔

`=> L = {4} `