Tìm số nguyên x

$$\begin{gathered} \mathrm{Tìm} \mathrm{số} \mathrm{nguyên} \mathrm{x},\mathrm{biết}: \\ 34+\left(21-\mathrm{x}\right)=\left(3747-30\right)-3746 \\ \left|\mathrm{x}+2\right|+21=25 \end{gathered}$$