0\\\\D=100-24=76=4*19\\\\x_1=\frac{10-2\sqrt{19}}{2}=5-\sqrt{19}\\\\x_2=5+\sqrt{19}" alt="1)\; 12(-4+7x) \geq -3x+9\\\\-48+84x+3x-9 \geq 0\\\\87x \geq 57\\\\x \geq \frac{57}{87}\\\\2)\; -2x^2+10x-12<0\\\\x^2-10x+6>0\\\\D=100-24=76=4*19\\\\x_1=\frac{10-2\sqrt{19}}{2}=5-\sqrt{19}\\\\x_2=5+\sqrt{19}" align="absmiddle" class="latex-formula">