Đáp án:
l. \(x = \dfrac{{36}}{{13}}\)
Giải thích các bước giải:
\(\begin{array}{l}
e.10{x^2} + 9x - 10{x^2} - 15x + 2x + 3 = 8\\
\to - 4x = 5\\
\to x = - \dfrac{5}{4}\\
f.4{x^2} - 4x - 3{x^2} + 15 - {x^2} = 7\\
\to - 4x = - 8\\
\to x = 2\\
g.5{x^2} + 5x = 2{x^2} + 3{x^2} - 3\\
\to 5x = - 3\\
\to x = - \dfrac{3}{5}\\
h.5x - 10{x^2} - 3{x^2} - 54x = 0\\
\to 2{x^2} - 64x = 0\\
\to {x^2} - 32x = 0\\
\to \left[ \begin{array}{l}
x = 0\\
x = 32
\end{array} \right.\\
k.10x - 5 + 32 - 12x = - 5\\
\to - 2x = - 32\\
\to x = 16\\
l.6x - 3 - 5x + 15 + 12x - 24 = 24\\
\to 13x = 36\\
\to x = \dfrac{{36}}{{13}}
\end{array}\)
