Bbbb
0}} \right. \\\\x^2+7x+6=0\; \; \to \; \; x_1=-1,\; x_2=-6\; (teor.\; Vieta)\\\\x^2+7x+6>0\; \; \; +++(-6)---(-1)+++\\\\x\in (-\infty,-6)U(-1,+\infty)\\\\\\2x-6 \geq 0,\; \; 2x \geq 6,\; \; x \geq 3\; \; \; ----------[3]////////////\\\\x\in [3,+\infty)\\\\\\ \left \{ {{x\in [3,+\infty)} \atop {x\in (-\infty,-6)U(-1,+\infty)}} \right. \; \; \to \; \; x\in [3,+\infty)" alt=" \left \{ {{2x-6 \geq 0} \atop {x^2+7x+6>0}} \right. \\\\x^2+7x+6=0\; \; \to \; \; x_1=-1,\; x_2=-6\; (teor.\; Vieta)\\\\x^2+7x+6>0\; \; \; +++(-6)---(-1)+++\\\\x\in (-\infty,-6)U(-1,+\infty)\\\\\\2x-6 \geq 0,\; \; 2x \geq 6,\; \; x \geq 3\; \; \; ----------[3]////////////\\\\x\in [3,+\infty)\\\\\\ \left \{ {{x\in [3,+\infty)} \atop {x\in (-\infty,-6)U(-1,+\infty)}} \right. \; \; \to \; \; x\in [3,+\infty)" align="absmiddle" class="latex-formula">