Question

-6а-7+4а-1   при а=0.5

Answer 1

-6а-7+4а-1=-2а-8=-2*0,5-8=-9

Answer 2

при а=0.5:
$-6a-7+4a-1=(-6+4)a-(7+1)=\\-2a-8=-2*0.5-8=-1-8=-9$