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(2x-5)²-(x+4)²<0
(2x-5+x+4)(2x-5-x+4)<0
(3x-1) (x-1)
pembuat nol:
• 3x-1<0
3x<1
x>1/3
• x-1 <0
x<1
Himpunan penyelesaian {x|x<1 atau x>1/3}