x^2^ - 15x + 54 = 0
x1+x2=15 (6, 9) x1•x2=54 (6, 9)
x1=6, x2=9
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x^2^ - 15x + 54 = 0
x1+x2=15 (6, 9) x1•x2=54 (6, 9)
x1=6, x2=9