For 2t = 4/7 you just divide both sides by 2 to get rid of the 2 on the t
t = 2/7
1/4x = 6
Multiply both sides by 4 to get rid of the 1/4 attached to the x
x = 24
For 2t = 4/7 you just divide both sides by 2 to get rid of the 2 on the t
t = 2/7