Giải thích các bước giải:
\(\begin{array}{l}
a.3x + 12 = 2x - 4\\
\to x = - 16\\
b.14 - 3x = - x + 4\\
\to 2x = 10\\
\to x = 5\\
c.2\left( {x - 2} \right) + 7 = x - 25\\
\to 2x - 4 + 7 = x - 25\\
\to x = - 28\\
d.17 - \left\{ { - x - \left[ { - x - \left( { - x} \right)} \right]{\rm{ }}} \right\} = - 16\\
\to 17 - \left[ { - x - \left( { - x + x} \right)} \right] = - 16\\
\to 17 - - 16 = - x + x - x\\
\to 33 = - x\\
\to x = - 33\\
e.x + \left\{ {\left( {{\rm{ }}x + 3} \right) - [\left( {x + 3} \right) - ( - x - 2]} \right\} = x\\
\to x + 3 - \left( {x + 3 + x + 2} \right) = 0\\
\to x + 3 - x - 3 - x - 2 = 0\\
\to x = - 2
\end{array}\)
