0\\\\28x>-4\\\\x>-\frac{1}{7}\\\\x\in (-\frac{1}{7}\, ,+\infty )" alt="1)\; \; x-16\leq 0\\\\x\leq 16\\\\x\in (-\infty ,16\, ]\\\\2)\; \; 28x+4>0\\\\28x>-4\\\\x>-\frac{1}{7}\\\\x\in (-\frac{1}{7}\, ,+\infty )" align="absmiddle" class="latex-formula">