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x in (-oo:+oo)
(10-(2*x))/4 > -3/7 // + -3/7
(10-(2*x))/4-(-3/7) > 0
(10-2*x)/4+3/7 > 0
(7*(10-2*x))/(4*7)+(3*4)/(4*7) > 0
7*(10-2*x)+3*4 > 0
82-14*x > 0
(82-14*x)/(4*7) > 0
(82-14*x)/(4*7) > 0 // * (4*7)^2
4*7*(82-14*x) > 0
( 4 )
4 > 0
x należy do R
( 7 )
7 > 0
x należy do R
( 82-14*x )
82-14*x > 0 // - 82
-14*x > -82 // : -14
x < -82/(-14)
x < 41/7
(-oo:41/7) (41/7:+oo) 4 + + 7 + + 82-14*x + -
x in (-oo:41/7)
(-oo:41/7)
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