2x^2 + 6x -20 = 0
x^2 +3x - 10=0
x = 2 и x = -5 2 - (-5) = 7
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2x^2 + 6x -20 = 0
x^2 +3x - 10=0
x = 2 и x = -5 2 - (-5) = 7