a) \(\Leftrightarrow12x^2+28x-24-12x^2+15x-3=-27\)
\(\Leftrightarrow43x=0\Leftrightarrow x=0\)
b) \(\Leftrightarrow60x^2+35x-60x^2+15x=-100\)
\(\Leftrightarrow50x=-100\Leftrightarrow x=-2\)
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