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X in (-oo:+oo)
13 < (1/2)*(6*X-4) // - (1/2)*(6*X-4)
13-((1/2)*(6*X-4)) < 0
(-1/2)*(6*X-4)+13 < 0
13-1/2*(6*X-4) < 0
13-1/2*(6*X-4) < 0
15-3*X < 0
15-3*X < 0
15-3*X < 0 // - 15
-3*X < -15 // : -3
X > -15/(-3)
X > 5
(-oo:5) (5:+oo) 15-3*X + -
X in (5:+oo)
(5:+oo)
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