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D( x )
7*x-8 = 0
7*x-8 = 0
7*x-8 = 0
7*x-8 = 0 // + 8
7*x = 8 // : 7
x = 8/7
x in (-oo:8/7) U (8/7:+oo)
(20*x-11)/(7*x-8) >= 2 // - 2
(20*x-11)/(7*x-8)-2 >= 0
(20*x-11)/(7*x-8)+(-2*(7*x-8))/(7*x-8) >= 0
20*x-2*(7*x-8)-11 >= 0
6*x+5 >= 0
(6*x+5)/(7*x-8) >= 0
(6*x+5)/(7*x-8) >= 0 // * (7*x-8)^2
(6*x+5)*(7*x-8) >= 0
( 6*x+5 )
6*x+5 >= 0 // - 5
6*x >= -5 // : 6
x >= -5/6
( 7*x-8 )
7*x-8 >= 0 // + 8
7*x >= 8 // : 7
x >= 8/7
(-oo:-5/6) (-5/6:8/7) (8/7:+oo) 6*x+5 - + + 7*x-8 - - +
x in (-oo:-5/6> U (8/7:+oo)
(-oo:-5/6> U (8/7:+oo)
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