Đáp án+Giải thích các bước giải:
$\displaystyle \begin{array}{{>{\displaystyle}l}} \mid 2x+1\mid -1=7\\ \Leftrightarrow \mid 2x+1\mid =8\\ \Leftrightarrow 2x+1=8\\ hoặc\ 2x+1=-8\\ \Leftrightarrow x=\frac{7}{2}\\ hoặc\ x=\ \frac{-9}{2}\\ 2.3^{X+1} =10.3^{12} +8.3^{12}\\ \Leftrightarrow 2.3^{X+1} =( 10+8) 3^{12}\\ \Leftrightarrow 2.3^{X+1} =18.3^{12}\\ \Leftrightarrow .3^{X+1} =3^{2} .3^{12}\\ \Leftrightarrow .3^{X+1} =3^{14}\\ \Leftrightarrow x+1=14\\ \Leftrightarrow x=13 \end{array}$