Respuesta :

kaffolter25

Step-by-step explanation: Solve for u by simplifying both sides of the equation, then isolating the variable . u=5
[tex]20 - u = 3u[/tex]
simplify both sides of the equation by adding u to both sides and then you have
[tex]20 = 4u[/tex]
simplify again by dividing both sides by 4 and then you get
[tex]u = 5[/tex]