Đáp án:
f) x=13
Giải thích các bước giải:
\(\begin{array}{l}
B1:\\
a)3x - 3 - 4 = 2x + 2 - 7\\
\to x = 2\\
b)\dfrac{{3\left( {10 - 3x} \right) - 2\left( {6x + 1} \right)}}{6} = 0\\
\to 30 - 9x - 12x - 2 = 0\\
\to 28 - 21x = 0\\
\to x = \dfrac{4}{3}\\
c)\dfrac{{3\left( {x - 1} \right) + 4\left( {x + 1} \right) - 6\left( {x - 1} \right)}}{{12}} = 0\\
\to - 3\left( {x - 1} \right) + 4x + 4 = 0\\
\to - 3x + 3 + 4x + 4 = 0\\
\to x = - 7\\
d)\dfrac{{2x + 6x - x - 3\left( {2x + 1} \right)}}{6} = 0\\
\to 7x - 6x - 3 = 0\\
\to x = 3\\
e)\dfrac{{3\left( {3x + 2} \right) - 3x - 1 - 12x - 2.5}}{6} = 0\\
\to 9x + 6 - 15x - 11 = 0\\
\to 6x = - 5\\
\to x = - \dfrac{5}{6}\\
f)\dfrac{{6\left( {x - 1} \right) + 3\left( {x - 1} \right) - 12 + 8\left( {x - 1} \right)}}{{12}} = 0\\
\to x - 1 - 12 = 0\\
\to x = 13
\end{array}\)
