3x - 1 - ( x - 4 ) = - ( 4 - x ) - 1 ;
3x - 1 - x + 4 = - 4 + x - 1 ;
2x + 3 = x - 5 ;
2x - x = - 5 - 3 ;
X = - 8
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[-6]------------[-2]------------------(4)---------------------(6)-
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[-6;4)∩[-2;6)=[-2;4)
(-2+4)/2=1
Окрестность 1
Радиус равен |4-(-2)|/2=6/2=3