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y=1/2(x+5)
(x-5)²=5*2y
x²-10x+25=5*(x+5)
x²-10x+25-5x-25=0
x²-15x=0
x*(x-15)=0
x=0, y=2,5 v x=15, y=10
Odp. x=0, y=2,5 lub x=15, y=10.
(5; x-5 ; 2y) - ciąg geometryczny