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a.-5x²+8x=0
b.x²+10x+25=0
c.3x+1supra x+2=x-1supra x-2
d.x²-12x+36=0
e. deschide parnteza x+1suprax-3inchide paranteza =0
f.-x²-9=0
va rog mult urgeeeeeeeenttttt ​