exam Maths Puzzle Numerical Ability

How would I solve this:
10x-1/4=9x+3/8

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exam Other Question

when there is a question like 34 over 5a = how do i work that out? I need help with another problem. I am solving for b using a^2+b^2=c^2, where a=9, and c = square root of 17. When I worked through, I came up with
b^2=-64. This doesnt seem right.