Book Maths Puzzle Algebra

Can you show me step by step on how to work or solve a quadratic formula problem like, 25x^2+4=-20x ?

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Book Other Question

If the area of a triangle is 125 m. and the base width equals 25 m. Find the height of the triangle. Henry planned to move 1/3 of his CD collection in the new cabinet in the morning and the rest in the afternoon. If he moved only 2/3 as many as he planned in the morning, what fraction of his CD's were left to be moved in the afternoon?