Start with

Subtract
from both sides:

Divide both sides by 

And thus we solved the expression for l:

D is distance.
<span>d/2 + d/4 = 6 </span>
<span>3d/4 = 6 </span>
<span>d = 8 km </span>
<span>Check: at 2 k/h, 4 hours; </span>
<span>at 4 k/h, 2 hours; </span>
<span>total, 6 hours. hope i helped</span>
Answer:
x = 15
Step-by-step explanation:
3x = 45
x = 45/3
<em><u>x = 15</u></em>
Answer:
X=16
Step-by-step explanation:
Solve 3(x-9)=21 IF X = 16
16-9 = 7
3X7= 21