exam Maths Puzzle Numerical Ability

I am trying to figure this equation out but I am doing it wrong. We do not have a text book to go by.
7x=36+4x
Thanks,
Brandon

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6x -1 2x = 3
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I need to come up on showing how to answer the square root of 74. It was from a question that started from 5 to the 2nd power + 7 to the second power which I believe is 74 so I nee