Question 372365
first sample 
–z – 3 < -4 
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Add z to both sides to get:
-3 < z-4
Add 4 to both sides to get:
z > 1
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second sample 4x < x + 6
Subtract x from both sides to get:
3x < 6
Divide both sides by 3 to get:
x < 2
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Cheers,
Stan H.