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81-9xkwadrat-9x=14-81
-9xkwadrat-9x=-67x(-1)
xkwadrat+9x=67
2)=(4xkwadrat+4x+1)-9(xkwadrat+x+1)=4-x
4xkwadrat+4x+1-9xkwadrat-9x-9=4-x
-5xkwadrat+5x=4-1-9
-5xkwadrat+5x=-4
3)=(2x-14)x<0
2xkwadrat-14x<0
4)=6x+9-4xkwadrat-6>1-2xkwadrat-6
-4xkwadrat+2xkwadrat+6x>-6+1+6-9
-2xkwadrat+6x>-8