exam Maths Puzzle Numerical Ability

one positive integer is 7 less than twice another. the sum of their squares is 346. find the integers

i dont understand how to set this up

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exam Other Question

Can you please help me in simplifying this complex fraction?

x-3/x+3 + x+3/x-3
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x-3/x+3 - x+3/x-3
Hi! I need help with square roots, Whith this one it's sasys to simplify to the simplest radical form.

The problem is:
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/x+5=8



Please and THank you=)