Answer :

[tex]10x + 5 = 80[/tex]

[tex]10x = 80-5[/tex]

[tex]10x = 75[/tex]

[tex]x= \frac{75}{10} [/tex]

[tex]x = 7,5[/tex]
[tex] 10x + 5 = 80\\ 10x=75\\ x=7.5[/tex]

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