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kalo iya.....
y=x^2
y+x=6
y=6-x
y=y
x^2=6-x
x^2+x-4=0
L=b^2-4ac
L=(1)^2-4(1)(-4)
L=1+16
L=17
D=(6 akar D) : 6a
D=6 akar 17 : 6(1)
D= akar 17