y=y^2-24y+144
-y^2+25y-144=0
D=49
y1=16
y2=9
x1=16-12= 4
x2=9-12= -3
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y=y^2-24y+144
-y^2+25y-144=0
D=49
y1=16
y2=9
x1=16-12= 4
x2=9-12= -3