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x²-3x+4x-20=x²-2x+4
x-20=-2x+4
x+2x=20+4
3x=24 |:3
x=8
x²-3x+4x-20=x²-2x+4
x²+x-20=x²-2x+4
x+2x=4+20
3x=24/:3
x=8