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Please help. I need to find the mistake or if there is no mistake.

Please help. I need to find the mistake or if there is no mistake.-example-1

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Okey, let's verify each step:

1 Step: She divided both sides by 3, this step is good.

2 Step: She must subtract 7 from both sides to clear a, but she didn't do it, the correct step is: a=-11-7=-18

The mistake is in the second step

User Sheren
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