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-x+7x+15-3≤0
6x+12≤0
x≤-12/6
x≤-2
b) x+11≥3-4x
x+4x+11-3≥0
5x+8≥0
x≥-8/5
c) -x-13≤3+7x
-x-7x-13-3≤0
-8x-16≤0
x≤-16/8
x≤-2
d) 2x+11≥6+5x
2x-5x+11-6≥0
-3x+5≤0
x≤5/3