EXPLANATION
Given the expression:
[tex]\frac{3}{4}r\text{ +2r + }\frac{1}{2}r[/tex]
First, taking r as a common factor:
[tex]r(\frac{3}{4}+2+\frac{1}{2})[/tex]
Then, adding 3/4 with 2 as follows:
[tex]\frac{3}{4}+2=\frac{11}{4}[/tex]
Replacing on the equation:
[tex]r(\frac{11}{4}+\frac{1}{2})[/tex]
Adding 11/4 and 1/2:
[tex]\frac{11}{4}+\frac{1}{2}=\frac{13}{4}[/tex]
Replacing on the equation and removing the parentheses:
[tex]\frac{13}{4}r[/tex]
