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4x²-25<4x²-36x+81+2
4x²-25<4x²-36x+83
4x²-4x²+36x<83+25
36x<108
x<3
4x²-25<4x²-36x+81+2
-25<-36x+83
36x<108
x<3
x∈(-∞,3)
4x²-25<4x²+36x+83/-4x²
-25>36x+83
36x>83+25
36x>108
x>3