mk đang cần gấp ai nhanh mk k cho thankkkkkk
\(a;\frac{2x+1}{6-x}=-\frac{2x+1}{x-6}=-\frac{2x-12+13}{x-6}=-2-\frac{13}{x-6}\)
\(\Rightarrow13⋮\left(x-6\right)\)
\(\Rightarrow x-6\in\left(1;-1;13;-13\right)\)
\(\Rightarrow x\in\left(7;5;19;-7\right)\)