Solve the inequality
Distribute the -3, watching the second sign. and , so the parentheses open to
Combine the constants on the left. :
Add 8n to both sides. This gathers the variable on the left with a positive coefficient, so no direction flip will be needed later:
Subtract 31 to isolate 5n.
Divide by the positive 5. Since the survives untouched, and is divisible by , so the bound is a clean integer:
This is the structural difference from the version of the same problem, where the bound comes out as .
Verify the boundary and both sides of it. At : left and right — equality holds ✓. At (inside): ✓. At (outside): left , right , and is false ✓, confirming the solution set is exactly .
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