Answer
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o<=0.7

↓Steps Explained:↓

Solve for o

1.8 + o ≤ 2.50

Divide each side by 1.8

1.8o
1.8
=
  
2.50
1.8

Group constants

Group our constants 1.8 and 2.50.
subtract 1.8 from both sides

o + 1.8 - 1.8 ≤ 2.50 - 1.8

Cancel 1.8 on the left side:

o ≤ 0.7

Final Answer

o<=0.7
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