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2x-5x ≥ -9 -3
-3x ≥ -12
x ≥ 4
2x -5x >-3-9
-3 x > -12
kalo pembagiannya negatif tandany dibalik
x > -12 : -3
x < 4
himpunan penyelesaian ( 0,1,2,3,4)
karena x bil.cacah