Giải thích các bước giải:
\(\begin{array}{l}
a.Pt \to 10x - 4 = 15 - 9x\\
\to 19x = 19 \to x = 1\\
b.\frac{{30x + 9}}{{36}} = \frac{{36 + 24 + 32x}}{{36}}\\
\to 30x + 9 = 32x + 60\\
\to 2x = - 51\\
\to x = - \frac{{51}}{2}\\
c.Pt \to 10x + 3 = 25 - 13 - 5x\\
\to 15x = 9\\
\to x = \frac{3}{5}\\
d.Pt \to 21x - 24.5\left( {x - 9} \right) = 80x + 6\\
\to 21x - 120x + 1080 = 80x + 6\\
\to 179x = - 1074 \to x = - 6\\
e.Pt \to 35x - 5 + 60x = 96 - 6x\\
\to 101x = 101\\
\to x = 1\\
f.6 - 18x = - 5x + 6\\
\to 13x = 0 \to x = 0
\end{array}\)
