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Sagot :

[tex] \tt{ \underline{{Answer:}}}[/tex]

[tex]\Large \tt{{6x + 9y + 7z}}[/tex]

[tex] \tt{ \underline{{Solution:}}}[/tex]

[tex]\Large \tt(15x + 20y + 19z) - (9x + 11y + 1)[/tex]

[tex]\Large \tt15 + 20y + 19z - (9x + 11y + 12z)[/tex]

[tex]\Large \tt15 + 20y + 19z - 9x - 11y - 12z[/tex]

[tex]\Large \tt \red{6x + 9y + 7z}[/tex]

[tex] \\ [/tex]

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