exam Maths Puzzle Numerical Ability

HELP!!! PLEASE!!

Solve: sqr is for square root.
7((2x-5)-(x+1))=(sqr7 +2)(sqr7 -2)

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exam Other Question

x+3 + x-1 = 9
x-2 x+1 2

solve for x
Simplify

4(-1) 4th power