Câu trả lời:

\(\left(2x-5\right)\left(x+2\right)-2x\left(x-1\right)=15\)

\(\Leftrightarrow\left(2x^2+4x-5x-10\right)-2\left(x^2-x\right)-15=0\)

\(\Leftrightarrow2x^2-x-10-2x^2+2x-15=0\)

\(\Leftrightarrow x=25\)