помогите -4/5а+1+5/6а=1/2а-2/5
- 4/5а+1+5/6а=1/2а-2/5 - 4/5а-1/2a+5/6a=-2/5+1 -4/5a-3/6a+5/6a=-2/5+5/5 -4/5a+2/6a=3/5 -4/5a+1/3a=3/5 -12/15a+4/15a=3/5 -8/15a=3/5 a=-9/8