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D( x )
7-(2*x) = 0
7-(2*x) = 0
7-(2*x) = 0
7-2*x = 0
7-2*x = 0 // - 7
-2*x = -7 // : -2
x = -7/(-2)
x = 7/2
x in (-oo:7/2) U (7/2:+oo)
5/(7-(2*x)) > 0
5/(7-2*x) > 0
( 5 )
5 > 0
x należy do R
( 7-2*x )
7-2*x > 0 // - 7
-2*x > -7 // : -2
x < -7/(-2)
x < 7/2
(-oo:7/2) (7/2:+oo) 5 + + 7-2*x + -
x in (-oo:7/2)
(-oo:7/2)
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