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Rezolvati ex:

•x-7x+12=
•xpatrat-6x+8=
•xpatrat-6x-7=
•xpatrat+9x+20=
•9xpatrat -36=
•3xpatrat +6x=
•49-xpatrat=
•4xpatrat +12x+9=
•9xpatrat-30x+25=​