a) \(\Rightarrow2021+x=0\Rightarrow x=-2021\)
b) \(\Rightarrow\left[{}\begin{matrix}x=47\\x=-9\end{matrix}\right.\)
c) \(\Rightarrow\left[{}\begin{matrix}x=0\\x=45\end{matrix}\right.\)
d) \(\Rightarrow144x-130x=56\Rightarrow14x=56\Rightarrow x=4\)
e) \(\Rightarrow\left(x+1\right)+3⋮\left(x+1\right)\)
\(\Rightarrow\left(x+1\right)\inƯ\left(3\right)=\left\{-3;-1;1;3\right\}\)
\(\Rightarrow x\in\left\{-4;-2;0;2\right\}\)
g) \(\Rightarrow4\left(x-2\right)+11⋮\left(x-2\right)\)
\(\Rightarrow\left(x-2\right)\inƯ\left(11\right)=\left\{-11;-1;1;11\right\}\)
\(\Rightarrow x\in\left\{-9;1;3;13\right\}\)
h) \(\Rightarrow3x=-21\Rightarrow x=-7\)
a: \(\Leftrightarrow x+2021=0\)
hay x=-2021
b: \(\Leftrightarrow\left[{}\begin{matrix}x=47\\x=-9\end{matrix}\right.\)
