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Sagot :

Answer:

[tex]-2\frac{1}{10}[/tex]

Step-by-step explanation:

The expression given can be rewritten as:

[tex]-\frac {4}{10}-x-\frac {9}{10}[/tex]

Because +(-n) is just -n. Then, combine like terms to get:

[tex]-\frac{13}{10}-x[/tex]

Substitute [tex]\frac{4}{5}[/tex] for x to get:

[tex]-\frac{13}{10}-\frac{4}{5}[/tex]

Which can be rewritten as:

[tex]-\frac{13}{10}-\frac{8}{10}[/tex]

Which is:

[tex]-\frac{21}{10}[/tex]. [tex]-2\frac{1}{10}[/tex] as a mixed number

Hope this helps :)