ДАЮ 50 БАЛЛОВ 1 или 3 задание, пожалуйста

1.
1)
$\frac{4x+13}{10}-\frac{5+2x}{4} \geq \frac{6-7x}{20}-1\\\\ \frac{4x+13}{10}-\frac{5+2x}{4} -\frac{6-7x}{20}+1\geq 0\\\\ \frac{2(4x+13)-5(5+2x)-(6-7x)+20}{20} \geq 0\\\\ \frac{8x+26-25-10x-6+7x+20}{20} \geq 0\\\\ \frac{5x+15}{20} \geq 0\\\\ 5x+15 \geq 0\\ 5x \geq -15\\ x \geq -3\\ x \in [-3;+\infty)$
2)
$\frac{1-2x}{5}-2 \ \textgreater \ -2\\\\ \frac{1-2x}{5}-2+2 \ \textgreater \ 0\\\\ \frac{1-2x}{5} \ \textgreater \ 0\\\\ 1-2x \ \textgreater \ 0\\ -2x \ \textgreater \ -1\\ x \ \textless \ \frac{1}{2}\\\\ \frac{1-2x}{5}-2 \ \textless \ 0\\\\ \frac{1-2x-10}{5} \ \textless \ 0\\\\ 1-2x-10 \ \textless \ 0\\ -2x \ \textless \ 9\\ x \ \textgreater \ -\frac{9}{2}\\\\ x \in (-\frac{9}{2}; \frac{1}{2})$