Question

3x.(12x-4)-9x.(4x-3)=30

Answer 1

\(3x.\left(12x-4\right)-9x.\left(4x-3\right)=30\)

\(36x^2-12x-36x^2=27x=30\)

\(15x=30\)

\(x=2\)

Answer 2

\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)

\(\Rightarrow36x^2-12x-36x^2+27x=30\)

\(\Rightarrow\left(36x^2-36x^2\right)+\left(27x-12x\right)=30\)

\(\Rightarrow15x=30\)

\(\Rightarrow x=2\)

Answer 3

\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)

\(\Rightarrow36x^2-12x-36x^2+27x=30\)

\(\Rightarrow15x=30\Rightarrow x=2\)

Vậy...............

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