Tìm x biết: 2x(3x + 5) – x(6x – 1) = 33
Tìm x biết: 2x(3x + 5) – x(6x – 1) = 33.
2x(3x + 5) – x(6x – 1) = 33
\( \Leftrightarrow 6{x^2} + 10x - 6{x^2} + 1 = 33\)
\( \Leftrightarrow 10x + 1 = 33 \Leftrightarrow 10x = 32 \Leftrightarrow x = 3,2\).