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2014-06-08T10:55:56+03:00
-1 < 4x+ 8/4 < 7

-1< 4x +2 < 7 |-2

-3 < 4x < 5 |:4

-3/4 < x < 5/4

-0,75 < x < 1,25
x∈N       ⇒x=1
1 5 1