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(13-x)10+x < 10x+(13-x)
130-10x+x < 10x+13-x
-9x+130 < 9x+13
18x > 117
x > 6,5
x ∈ (6,5; +∞)
b)
(13-x)10+x > 10x+(13-x)
130-10x+x > 10x+13-x
-9x+130 > 9x+13
18x < 117
x < 6,5
x ∈ (-∞; 6,5)
A
(13-x)10+ x <10x+(13-x)
130 - 10x +x < 10x +13 - x
130 -13 < 10x -x -x +10x
117 < 18x
x> 6,5
B.
(13-x)10+ x >10x+(13-x)
130 - 10x +x > 10x +13 - x
130 -13 > 10x -x -x +10x
117 < 18x
x< 6,5