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a) x²-8x-20=0
b)x²+x²-3x-2=0
2x²-3x-2=0
c)3y²-6y=y²-20
3y²-y²-6y+20=0
2y²-6y+20=0
d) 2y²-3y=12-y
2y²-3y+y-12=0
2y²-2y-12=0