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x=1+y
(1+y)²-(1+y)y+y²=7
1+2y+y²-y-y²+y²=7
1+y+y²=7
y²+y-6=0
(y+3)(y-2)=0
y+3=0 atau y-2=0
y₁=-3 atau y₂=2
y₁+y₂=-3+2=-1
maaf hnya sebnyak itu