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(6x-4)(2x-1)=4x(3x-4)+20
12x²-6x-8x+4=12x²-16x+20
12x²-14x+4=12x²-16x+20
12x²-12x²-14x+16x=20-4
2x=16
x=16/2
x=8
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B.
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C.
Sambil dicek lagi ya :)