Question

[Xuan Nguyen]

a)3(5x - 1) –x (x- 2) +x² -13x =7
b)1/5x(10x - 15) - 2x(x - 5) = 12

Answer 1

[Nguyễn Huy Tú]

\(15x-3-x^2+2x+x^2-13x=7\)

\(\Leftrightarrow4x=10\Leftrightarrow x=\dfrac{5}{2}\)

Answer 2

[Nguyễn Như Lan]

Ta có:

     3(5x - 1) - x(x - 2) + x² - 13x = 7

→15x - 3 - x² + 2x + x² - 13x = 7

→4x - 3 = 7

→4x = 10

→x = \(\dfrac{5}{2}\)