Answer:
29 lol i took this st00pid test and got it right :)
Explanation:
WX=29
ST=10x+5
WX=7x+8
UV=8x-1
since SW=UW, WX is centered between UV and ST
(10x+5)-(7x+8)=(7x+8)-(8x-1)
3x-3=-x+9
4x=-12
x=3
substitute
WX=7(3)+8=29
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