Ответ:

Пошаговое объяснение:

(8/15*n+2/3*n+n-8/15*n=8n+10n+15n-8n)/15=25n/15n=5/3n.

n=3/5.

5/3*3/5=1.

n=12.

5/3*12=20.

(4х+5)*2/5=(11+х)*2/5.

8/5*х+2=22/5+2/5*х.

8/5*х-2/5*х=22/5-2.

(8х-2х)/5=4,4-2

6/5*х=2 4/10=2 2/5.

х=12/5:6/5=2.