a) \(\dfrac{3}{4}x-x=-2\)
\(\Leftrightarrow0,75x-x=-2\)
\(\Leftrightarrow x\left(0,75-1\right)=-2\)
\(\Leftrightarrow x.\left(-0,25\right)=-2\)
\(\Leftrightarrow x=\left(-2\right):\left(-0,25\right)\)
\(\Leftrightarrow x=8\left(tm\right)\)
Vậy ..................
b) \(\dfrac{2}{3}+\dfrac{1}{3}:x=-1\)
\(\Leftrightarrow\dfrac{1}{3}:x=\left(-1\right)-\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{1}{3}:x=-\dfrac{5}{3}\)
\(\Leftrightarrow x=\dfrac{-5}{3}.\dfrac{1}{3}\)
\(\Leftrightarrow x=\dfrac{-5}{9}\left(tm\right)\)
Vậy ......................
c) \(\left|2x-1\right|=5\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x=6\\2x=-4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=3\\x=-2\end{matrix}\right.\)\(\left(tm\right)\)
Vậy ....................
