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x in (-oo:+oo)
(-2/39)*x-(1/2)-3 < (1/2)*(5-x) // - (1/2)*(5-x)
(-2/39)*x-((1/2)*(5-x))-(1/2)-3 < 0
(-1/2)*(5-x)+(-2/39)*x-1/2-3 < 0
(-2*x)/39-1/2*(5-x)-1/2-3 < 0
(-1/2*2*39*(5-x))/(2*39)+(-2*2*x)/(2*39)+(-1*39)/(2*39)+(-3*2*39)/(2*39) < 0
-1/2*2*39*(5-x)-2*2*x-1*39-3*2*39 < 0
35*x-234-195-39 < 0
35*x-234-234 < 0
35*x-468 < 0
(35*x-468)/(2*39) < 0
(35*x-468)/(2*39) < 0 // * (2*39)^2
2*39*(35*x-468) < 0
( 2 )
2 < 0
x belongs to the empty set
( 35*x-468 )
35*x-468 < 0 // + 468
35*x < 468 // : 35
x < 468/35
( 39 )
39 < 0
x belongs to the empty set
(-oo:468/35) (468/35:+oo) 2 + + 35*x-468 - + 39 + +
x in (-oo:468/35)
(-oo:468/35)
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