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6x - 3x > -9 + 12
3x > 3
x > 3/3
x > 1
b. 2x - 6 + 3x - 12 < -3
2x + 3x < -3 + 12 + 6
5x < -3 +18
5x < 15
x < 15/5
x < 3
6x-12>3x-9
3x-3>0
3x>3
x>1
HP = {x>1}
b.
2x-6+3x-12<_-3
5x-15<_0
5x<_15
x<_3
HP ={x<_3}