Answer
$$9-(x+9)=-x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}9-(x+9)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9-x-9 \xlongequal{ } \\[1 em] & \xlongequal{ } \cancel{9}-x -\cancel{9} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-x\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( x+9 \right) = -x-9 $$ |
| ② | Combine like terms: $$ \, \color{blue}{ \cancel{9}} \,-x \, \color{blue}{ -\cancel{9}} \, = -x $$ |
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