book Maths Puzzle Numerical Ability

Solve the equation:

(w - 4)^2 = 2w^2 - 6w + 1 solve for w

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book Other Question

w+3-(-8+w)
????
Please help
I'm not sure how to solve a paragraph proof and a flow proof properly and I was wondering if you could give me some examples and show me the right way to solve them.