\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)
\(\Rightarrow36x^2-12x-36x^2+27x=30\)
\(\Rightarrow15x=30\)
Vậy \(x=2\)
\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)
\(\Rightarrow x\left(36x-12\right)-x\left(36x-27\right)=30\)
\(\Rightarrow x.\left[\left(36x-12\right)-\left(36x-27\right)\right]=30\)
\(\Rightarrow x.\left(36x-12-36x+27\right)=30\)
\(\Rightarrow x.\left(-12+27\right)=30\)
\(\Rightarrow15x=30\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
\(\Leftrightarrow36x^2-12x-36x^2+27x=30\)
\(\Leftrightarrow15x=30\Leftrightarrow x=2\)
