Answer:
u=8
Step-by-step explanation:
Greetings !
Given expression
[tex]3u + 9 - 8u = - 31[/tex]
Group like terms of the expression
[tex]3u - 8u + 9 = - 31[/tex]
Add similar elements
[tex]3u - 8u = - 5u[/tex]
Thus,
[tex] - 5u + 9 = - 31[/tex]
subtract 9 from both sides
[tex] - 5u + 9 - 9 = - 31 - 9[/tex]
simplify
[tex] - 5u = - 40[/tex]
then divide both sides of the expression by -5.
[tex] \frac{ - 5u}{ - 5} = \frac{ - 40}{ - 5} [/tex]
simplify
[tex]u = 8[/tex]
Hope it helps!
