First, get x by itself so: x <= 8.

This means that x is equal to all numbers less than or equal to 8.

Interval notation: ( or ) means less than/greater than.

[ or ] means less than or equal to/ greater than or equal to.

SO:

x = (- infinity sign, 8].

You know the infinity sign right: the figure eight. Because infinity is not a specific number, we use parenthesis. Because 8 is a specific number, we use ].

Hope that helps

6 + x <_ 14

x <_ 8

(-infinity, 14]

6≤14-x

6-14≤-x

-8≤-x

8≥x