Answer:
The first one is x = 3. The second one is x = 1/3.
Step-by-step explanation:
I just tested numbers until I got the correct one.
R/ r+ 15 = 3/8
Cross multiply: top of one side multiplied by bottom of other side:
R x 8 = 3 x r+ 15
Simplify:
8r = 3r + 45
Subtract 3r from both sides:
5r = 45
Divide both sides by 5:
R = 9
