\[-2x+(8+x)<9\]
1
Remove parentheses.
−2x+8+x<9-2x+8+x<9

2
Simplify  −2x+8+x-2x+8+x  to  −x+8-x+8.
−x+8<9-x+8<9

3
Regroup terms.
8−x<98-x<9

4
Subtract 88 from both sides.
−x<9−8-x<9-8

5
Simplify  9−89-8  to  11.
−x<1-x<1

6
Multiply both sides by −1-1.
x>−1x>-1

Done
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