[tex]\frac{x}{18}[/tex] and [tex]\frac{3}{18}[/tex] both have a common denominator, so you can combine them into a single fraction:
[tex]\frac{x}{18}+\frac{3}{18}=\frac{x+3}{18}[/tex]
You cannot simplify this fraction further:
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Answer:
[tex]\boxed{\frac{x+3}{18}}[/tex]
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