Question

giải pt 4(5x-3) -3 (2x+1)=9

Answer 1

\(4\left(5x-3\right)-3\left(2x+1\right)=9\)

\(\Leftrightarrow20x-12-6x-3=9\)

\(\Leftrightarrow14x=9+12+3\)

\(\Leftrightarrow14x=24\)

\(\Leftrightarrow x=\dfrac{24}{14}=\dfrac{12}{7}\)

Vậy tập nghiệm của PT là \(S=\left\{\dfrac{12}{7}\right\}\)

Answer 2

\(4\left(5x-3\right)-3\left(2x+1\right)=9\)

\(\Leftrightarrow20x-12-6x-3-9=0\)

\(\Leftrightarrow14x-24=0\)

\(\Leftrightarrow x=\dfrac{24}{14}\)

Vậy \(S=\left\{\dfrac{24}{14}\right\}\)