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How do I work out 3x + 65 = 7x + 13

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AL2006id
3x + 65 = 7x + 13

Here's one way:

Subtract  3x  from each side:      65  =  4x + 13

Subtract  13  from each side:      52  =  4x

Divide each side by  4 :                13  =  x