х²+х< x(x+5)+5
x²+x<x²+5x+5
x²+x-x²-5x-5<0
-4x-5<0
-4x<5
x>-5/4
B. x∈(-5/4; +∞)
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х²+х< x(x+5)+5
x²+x<x²+5x+5
x²+x-x²-5x-5<0
-4x-5<0
-4x<5
x>-5/4
B. x∈(-5/4; +∞)