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2014-08-27T18:16:42+03:00
A)x-159=267
   x=267+159=426
b)x+425=638
   x=638-425=213
c)x+43+323=975
   x+366=975
   x=975-366=609
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2014-08-27T18:17:16+03:00
X-67-92=267
X=267+159
X=426
542+X-117=638
X=638-425
X=213
(43+X)+(537-214)=975
43+X=975-323
X=609

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