Question

Номер 628 помогите пж

Answer 1

1) x/-1/2=8/9
-2x=8/9
x=-4/9
2) (15x+8)*2/3=-20
30x+16=60
30x=44
x=22/15
3)-(8y+3)*5/21=4/7
-7(40y+15)=84
40y=-12-15
y=-27/40