9x²+4+12x=0
9x²+12x+4=0
(3x+2)²=0
3x+2=0
3x=-2
x=-⅔
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9x²+4+12x=0
9x²+12x+4=0
(3x+2)²=0
3x+2=0
3x=-2
x=-⅔