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x + y = 4 -> y = 4 - x
-x^2 + 2x + 4 = 4 -x
-x^2 + 2x + 4 - 4 + x = 0
-x^2 + 3x = 0
x ( -x + 3 ) = 0
•> x =0
•> -x = -3
x = 3
maaf kalo salah ✌