(x+1)(x-1)-(x+2)^2=7

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(x+1)(x-1)-(x+2)^2=7(x+1)(x-1)-(x+2)^2=7(x+1)(x-1)-(x+2)^2=7算x?负三

(x+1)(x-1)-(x+2)^2=7
(x+1)(x-1)-(x+2)^2=7

(x+1)(x-1)-(x+2)^2=7

算x?负三