(x_(1)+(-7))/2=-1,
x_(1)-7=-2,
x_(1)=5;
(y_(1)+2)/2=4,
y_(1)+2=8,
y_(1)=6;
М(5; 6)
2) N(x_(2); y_(2))
(-8+x_(2))/2=-3,
-8+x_(2)=-6,
x_(2)=2;
(-16+y_(2))/2=4,
-16+y_(2)=8,
y_(2)=24;
N(2;24)
3) Q(x_(3); y_(3))
x_(3)=(24+(-2))/2=(24-2)/2=11,
y_(3)=(3+(-11))/2=(3-11)/2=-4,
Q(11; -4).