a) \(6x\left(3x+5\right)-2x\left(9x-2\right)=17\Leftrightarrow18x^2+30x-18x^2+4x=17\)
\(\Leftrightarrow34x=17\Leftrightarrow x=\dfrac{17}{34}=\dfrac{1}{2}\) vậy \(x=\dfrac{1}{2}\)
b) \(2x\left(3x-1\right)-3x\left(2x+11\right)-70=0\Leftrightarrow6x^2-2x-6x^2-33x-70=0\)
\(\Leftrightarrow-35x-70=0\Leftrightarrow35x=-70\Leftrightarrow x=\dfrac{-70}{35}=-2\) vậy \(x=-2\)