Chắc x =)))

\(2x\left(x-1\right)=\left(x-1\right)^2\)

\(2x\left(x-1\right)-\left(x-1\right)^2=0\)

\(\left(x-1\right)\left[2x-\left(x-1\right)\right]=0\)

\(\left(x-1\right)\left(2x-x+1\right)=0\)

\(\left(x-1\right)\left(x+1\right)=0\)

\(x^2-1^2=0\)

\(x^2-1=0\)

\(x^2=0+1\)

\(x^2=1\)

\(x=\pm1\)

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A

(X + X x 9) : 35 = 504

X + 9X = 504 x 35

10X = 17640

X = 17640 : 10

X = 1764