For this case we have the following equation:
[tex]\frac {u + 4} {6} = \frac {5} {4}[/tex]
We must clear the value of the variable "u":
Multiplying by 6 on both sides we have:
[tex]u + 4 = \frac {5 * 6} {4}\\u + 4 = \frac {30} {4}[/tex]
Simplifying the right side of the equation:
[tex]u + 4 = \frac {15} {2}[/tex]
Subtracting 4 from both sides:
[tex]u = \frac {15} {2} -4\\u = \frac {15-8} {2}\\u = \frac {7} {2}[/tex]
Answer:
[tex]u = \frac {7} {2}[/tex]
