a: \(\Leftrightarrow\left(x^2-9\right)\left(12x-3-10x-5\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(x+3\right)\left(2x-8\right)=0\)
hay \(x\in\left\{3;-3;4\right\}\)
b: \(\Leftrightarrow\left(x^2-2x+6\right)\left(2x-3\right)-\left(2x+3\right)\left(2x-3\right)=0\)
\(\Leftrightarrow\left(2x-3\right)\left(x^2-2x+6-2x-3\right)=0\)
\(\Leftrightarrow\left(2x-3\right)\left(x-3\right)\left(x-1\right)=0\)
hay \(x\in\left\{\dfrac{3}{2};3;1\right\}\)
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