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Verified answer
3x^2 + 6x = 0x (3x+6) = 0
x = 0
3x +6 = 0
3x = -6
x = -2
3x(x+2) = 0
3x = 0
x1 = 0
x+2 = 0
x2 = -2
HP : {0,-2}