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|2x+3|=1
(2x+3)²=1²
4x²+12x+9=1
4x²+12x+8=0
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(2x+4)(2x+2)=0
2x+4=0
2x=-4
x=-4/2
x=-2
Atau
2x+2=0
2x=-2
x=-2/2
x=-1
α+β=(-2)+(-1)=-3
Pilihan A.-3
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