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6x-3x>12-9
3x>3
x>3/3
x>1
{2,3,4,5,...}
6x - 12 > 3x - 9
6x - 3x > -9 + 12
3x > 3
x > 1
b. 2(x-3) + 3(x-4) < -3
2x - 6 + 3x - 12 < -3
2x + 3x - 6 - 12 < -3
5x - 18 < -3
5x < -3 + 18
5x < 15
x < 3
semoga bermanfaat