Posted by help on Sunday, January 24, 2010 at 9:26pm.
0.4x+4<0.8x-7
0.4x+4 ≤ 0.8x-7 multiply by 10
4x + 40 ≤ 8x - 70
-4x ≤ 110
x ≥ -55/2 or x ≥ -27.5
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