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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exam Other Question
Simplify:


((x^(3/2))y^-3)^1/3
--------------------
((x^(1/2))y^-6)^-1

</PRE> is there every a time when a value is a solution to both inequality and an equation