А) 8.9 х +17.54=5.4х+2.84 б) 4/15у +2.8=6.3-3/20

а) 8.9 х +17.54=5.4х+2.84
8.9x-5.4x=2.84-17.54
3.5x=-14.7
x=-14.7:3.5
x=-4.2

Б) 4/15у +2.8=6.3-3/20
4/15y=63/10-3/20-28/10
4/15y=126/20-3/20-56/20
4/15y=67/20
y=67/20:4/15
y=67/20*15/4=67/4*3/4
y=201/16=12 9/16

А)8.9х-5.4х=2.84-17.54
3.5х=-14,7
х=-14,7:3.5
х=-4.2

б)4:15у+2.8=6.3-3:20
15у=6.3-0.15-4-2.8
15у=2.3-0.15-2.8
15у=-0.5-0.15
15у=-0.65
у=-0.65:15
у=-0.04