Book Maths Puzzle Algebra

I need help showing my daughter how to do problems like 6x to the 2 power+53x-50=-12

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high school graduating class is made up of 466 students. There are 212 more girls than boys. How many boys are in the class? the lenght of a rectangle is 6 inches more than the width. The perimeter of the rectangle can be no more than 48 inches. what is the maximum width?

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