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monadic quadratic equation
1. As long as x=(d-b)/(a-c)=2, such as 3x+4=2x+6.

2. Divide both sides of the equation by the square of y at the same time, and after simplification, x/y can be obtained by using the root formula.

3. No matter which side the door is one meter wide, the equation is as follows:

x(25-2x+ 1)=80

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