book Maths Puzzle Numerical Ability

what is 8(4u-1)- 12u=11(2u-6)

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book Other Question

The length of a rectangular frame is 8cm more than the width. The area inside the frame is 105 sq cm. Find the width of the frame. Please help me with this problem:

(x+y)squared - (a-b)squared

I don't know where to begin