Question

2(x-3)+5x(x-1)=5x^2

Answer 1

`2 ( x - 3 ) + 5x ( x - 1 ) = 5x^2`

`<=> 2x - 6 + 5x^2 - 5x - 5x^2 = 0`

`<=> -3x = 6`

`<=> x = -2`

Vậy `S = {-2}`

Answer 2

2(x - 3) + 5x(x - 1) = 5x²

<=> 2x - 6 + 5x² - 5x - 5x² = 0

<=> -3x - 6 = 0

<=> -3x = 6

<=> x = -2

Answer 3

2(x-3)+5x(x-1)=5x²
<=> 2x - 6 + 5x² - 5x = 5x²
<=> - 3x - 6 = 5x² - 5x²
<=> - 3x - 6 = 0
<=> - 3x = 6
<=> x = - 2
Vậy S = { - 2 }