Find the value of `x` in the following proportions: `2/7=4/x` and `7:3::x:12`

Find the value of x in each of the followings proportions. (i) 17: 68 :: 7 :x (ii( 14 : 42 :: x: 27

Find x in the following proportion : 7 : 4 :: x : 16

Find x in the following proportional : 15 : x = 7 : 14

Find the value of x in each of the following : 42 : 12 : : 7 : x

Find the value of x in the following: 1 2/3-:2/7xx x/7=1 1/4xx2/3-:1/6

Find the value of x: 3 - x = 4 x - 7

Find the values of x and y from the following equation , 2[{:(x,5),(7,y-3):}]+[{:(3,-4),(1,2):}]=[{:(7,6),(15,14):}] .

Find the values of x and y from the following equation: 2[[x,5],[7,y-3]] + [[3,-4],[1,2]] = [[7,6],[15,14]]