1.... spot tween -2 & 7
twies as far from 7 as from -2 implie (2/3) av dist from 7
7-(-2)=9, so (2/3)*9=6=distans from 7
spot 1...x=1
2.... other side av -2: (negativ number > 2)
distans from 7=x+7
distans from -2=x-2
x+7=2*(x-2)=2x-4
2x-x=7+4=x=11
spot 2=-11...distans from -2=9, distans from +7 =18