vs
\(\Leftrightarrow\dfrac{3x+1-3\left(x-3\right)-2\left(2x-1\right)-30}{6}\le0\)
\(\Leftrightarrow3x+1-3x+9-4x+2-30\le0\)
\(\Leftrightarrow-4x-18\le0\)
\(\Leftrightarrow-4x\le18\)
\(\Leftrightarrow x\ge-\dfrac{9}{2}\)
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