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2x²-9=4x²+12x+9
0=2x²+12x+9
0=2(x²+6x+9)
0=x²+6x+9
(x+3)²=0
x+3=0
x= - 3
x +3
x +3
3x+3x = 6x
(x+3)(x+3) = 0
x +3 = 0 x +3 = 0
x = -3 x = -3
CS =(-3)