Question

x(во 2-ой степени) - 4x =x
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5

Answer 1

$\frac{x^{2}-4x }{5} = x\\x^{2} -4x = 5x\\x^{2} -4x-5x = 0\\x^{2} -9x=0\\x(x-9)=0\\x_1 = 0\\\\x_2 - 9 =0\\x_2 = 9$

Ответ: 0; 9.