Решите пожалуста номер 860

1)
$1.1x-2 \frac{1}{2}= \frac{3}{5}x \\ \\ 1.1x-2.5=0.6x \\ 1.1x-0.6x=2.5 \\ 0,5x=2.5 \\ x=2,5:0,5 \\ x=5$

2)
$6.75x=2 \frac{1}{4} x-9 \\ \\ 6.75x=2.25x-9 \\ 6.75x-2.25x=9 \\ 4.5x=9 \\ x=9:4.5 \\ x=2$

3)
$16-9 \frac{1}{2} y=3y+21 \\ \\ 16-9.5y=3y+21 \\ 3y+9.5y=16-21 \\ 12.5y=-5 \\ y=-5:12.5 \\ y=-0,4$

4)
$1 \frac{1}{4} y+7.5=5y \\ \\ 1.25y+7.5=5y \\ 5y-1.25y=7.5 \\ 3.75y=7.5 \\ y=7.5:3.75 \\ y=2$

5)
$0.5x-7=- \frac{2}{3} x \\ \\ 0.5x*3-7*3=-2x \\ 1.5x-21=-2x \\ 2x+1.5x=21 \\ 3.5x=21 \\ x=21:3.5 \\ x=6$

6)
$6y-2 \frac{4}{5} =2.5y \\ \\ 6y-2.8=2.5y \\ 6y-2.5y=2.8 \\ 3.5y=28 \\ y=28:3.5 \\ y=8$