B8 = b1·q^7 = 1·(-2)^7= - 128
3х-х/4=3/4-2/8-5
12х/4-х/4=6/8-2/8-40/8
11х/4=-36/8
11х*8=-36*4
22х=-36
х=-13/11
х=-1 2/11
5x+3y=4 5x+3y=4
-2x+y=2m 6x-3y=-6m
11x=4-6m x=(4-6m)/11
y=2m+2x=2(m+(4-6m)/11)=(2/11)(11m+4-6m)=(2/11)(5m+4)
x+y>0
x+y=2/11(2-3m+5m+4)=2/11(2m+6)>0
2m+6>0 m>-3 m=-2
x=(4+12)/11=16/11
y=(-10+4)*2/11=-12/11
ответ m=-2