Solve: 5x^2 + 25x = 0.

x = 0, x = 5

x = 0, x = - 5

x = - 5, x = 0, x = 5

x = 5, x = 25

The sum of three numbers is 129. The third number is 4 times the first. The first number is 9 less than the second. What are the numbers?

How to change a mix number into a improper fraction

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