Joe solved the equation 3 + x/2 = 10 and justified each step as shown. Identify Joe's error and fix his mistake. ( Only answer if you truly know how. No Plagiarism and please don't reposted another students answer on brianly. Will Mark Brainliest).

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He swapped the Subtraction Property of Equality and the Multiplication Property of Equality.
The proper steps in order would be as shown:
3 + x / 2 = 10 Given equation
x / 2 = 7 Subtraction Property of Equality (-3 from both sides)
x = 14 Multiplication Property of Equality (x2 on both sides)