exam Maths Puzzle Numerical Ability

I need to solve this to its simplified form, can you help please?

x + 1 _ x - 4 = 1 - x
4 3 2

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exam Other Question

Three numbers added together total 68. The second number is four more than the first, the third number is twice the first. find the numbers. QR is the arc of a circle with center P. If the length of arc QR is 6pi what is the area of sector PQR