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x²+1+2x+5=x²-9+6x+13
6+9-13=6x-2x
2=4x /4
x=0.5 lub ½
:)
x kwadrat+2x+2x-x kwadrat-6x=-1-5+13-9
2x+2x-6x=-2
4x-6x=-2
-2x=-2 /:(-2)
x=1