Find the value of x if `6:9=x:6`

Find the value of x if 5:3 :: x: 6.

Find the value of x if 6 = 3(x-4)

Find the value of x if |2x+6|=-8

Find the value of x if 2x^(2)+6|x| +3=0

(a) Find the value of x if 1 + 6 + 11 + ... + x = 189. (b) Find the value of x if 3 + 6 + 9 + ... + 96 = x.

Find the value of x 0.9 : 0.6 :: x : 3

Find the value of x in (-6)^(x)=-216

Find the value of x if abs([x,2],[18,x]) = abs([6,2],[18,6])

Find the value of 9 + | - 6 |