X-5=7
X-8=20
X+2=-1
X-9=12
X+-6=-7
X-8=-3
-7-X=-9

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Step-by-step explanation:

x - 5 = 7

x = 12

x - 8 = 20

x = 28

x + 2 = -1

x = -3

x - 9 = 12

x = 21

x + -6 = -7

x = -1

x - 8 = -3

x = 5

-7 - x = -9

-7 = x - 9

2 = x

30 people weigh 160 pounds or more

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4