Двойные неравенства сроочно !!!

1)  [latex]1 \leq \frac{5+x}{2} \ \textless \ 2.5[/latex] [latex]1*2 \leq \frac{5+x}{2}*2 \ \textless \ 2.5*2[/latex] [latex]2\leq 5+x \ \textless \ 5[/latex] [latex]2-5\leq 5+x -5 \ \textless \ 5-5[/latex] [latex]-3 \leq x \ \textless \ 0[/latex] [latex][-3;0)[/latex] 2)  [latex]0 \ \textless \ \frac{2x+3}{5}\ \textless \ 1[/latex] [latex]0*5 \ \textless \ \frac{2x+3}{5}*5\ \textless \ 1*5[/latex] [latex]0 \ \textless \ 2x+3\ \textless \ 5[/latex] [latex]0 -3\ \textless \ 2x+3-3\ \textless \ 5-3[/latex] [latex]-3\ \textless \ 2x\ \textless \ 2[/latex] [latex]\frac{-3}{2} \ \textless \ \frac{2x}{2}\ \textless \ \frac{2}{2}[/latex] [latex]-1.5\ \textless \ x\ \textless \ 1[/latex] [latex](-1.5;1)[/latex] 3)  [latex]2.15 \ \textless \ \frac{3x-1}{4}\ \textless \ 2.6[/latex] [latex]2.15*4\ \textless \ \frac{3x-1}{4}*4\ \textless \ 2.6*4[/latex] [latex]8.6\ \textless \ 3x-1\ \textless \ 10.4[/latex] [latex]8.6+1\ \textless \ 3x-1+1\ \textless \ 10.4+1[/latex] [latex]9.6\ \textless \ 3x\ \textless \ 11.4[/latex] [latex]\frac{9.6}{3}\ \textless \ \frac{3x}{3}\ \textless \ \frac{11.4}{3}[/latex] [latex]3.2\ \textless \ x\ \textless \ 3.8[/latex] [latex](3.2;3.8)[/latex] 4)  [latex]-1 \ \textless \ \frac{3x-1}{4}\ \textless \ 2[/latex] [latex]-1 *4\ \textless \ \frac{3x-1}{4}*4\ \textless \ 2*4[/latex] [latex]-4\ \textless \ 3x-1 \textless \ 8[/latex] [latex]-4+1\ \textless \ 3x-1+1 \textless \ 8+1[/latex] [latex]-3\ \textless \ 3x \textless \ 9[/latex] [latex]\frac{-3}{3}\ \textless \ \frac{3x}{3} \textless \ \frac{9}{3}[/latex] [latex]-1\ \textless \ x \textless \ 3[/latex] [latex](-1;3)[/latex]