Hello!
You solve this algebraically.
6(t - 2) = 2(9 - 2t)
Distribute the 6
6t - 12 = 2(9 - 2t)
Distribute the 2
6t - 12 = 18 - 4t
Add 4t to both sides
10t - 12 = 18
Add 12 to both sides
10t = 30
Divide both sides by 10
t = 3
The answer is 3
Hope this helps!
