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y²-2x=9
x=y+3
-2x=9-y²
x=y+3
x=y²/2 - 4,5
y+3 = y²/2 - 4.5
2y+6=y² - 9
y²-2y-15=0
D=b²-4ac = 4 + 60 = 64. корень из D = 8. y1=(2+8)/2=5, y2=(2-8)/2=-3;
y1=5, y2 = -3;
x1=8, x2 = 0.