Solve: x²+x+6=0, x = -2,-4, x = 4,-2, x = 5,7, x = -2,-2, Solve: x²-5x+4=0, x = 2,3, x = -1,-4, x = 1,4, x = 5,4, Solve: x²-25=0, x = 5,5, x = 4,-5, x = -25,25, x = 5,-5

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