Toán Lớp 8: c) (x+3) (x^2-x+1)-x(x^2-2)=4 d) (3x-2) (x+9)-3x (x+5)=7 -

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Toán Lớp 8: c) (x+3) (x^2-x+1)-x(x^2-2)=4 d) (3x-2) (x+9)-3x (x+5)=7