Giải thích các bước giải:
\(\begin{array}{l}
B2:\\
a.3\left( {2x - 10} \right) = 5.12 + \left( {2 - 3x} \right).2\\
\to 6x - 30 = 60 + 4 - 6x\\
\to 12x = 94 \to x = \frac{{47}}{6}\\
b.3\left( {2x - 3} \right) + 12.2 = 2\left( {1 - x} \right)\\
\to 6x - 9 + 24 - 2 + 2x = 0\\
\to 8x = - 13\\
\to x = - \frac{{13}}{8}\\
c.5x = 15 \to x = 3\\
d.x\left( {x - 2} \right) - 3\left( {x - 2} \right) = 0\\
\to \left( {x - 2} \right)\left( {x - 3} \right) = 0\\
\to \left[ \begin{array}{l}
x = 2\\
x = 3
\end{array} \right.
\end{array}\)
