Fill the blank spaces to complete the text.
x / 3 = 12 / x ... x = 
3x –1 = 8 ... ... x = 
( x + 3 ) / 2 = 2 ... x = 
( x – 5 ) / 3 = 1 ... x = 
x / 2 + 3 = 5 ... ... x = 
2x – 3 = 3 – x ... x = 
x – 1 = 2x / 3 ... x = 
x / 3 – 1 = 2 ... x = 
2x + 5 = x + 7 ... x = 
( 2x – 5 ) / 3 = 3 ... x = 
2x + 3 = 9 ... ... x = 
5·(x – 7) = 10 ... x = 
(3x – 1) / 2 = 7 ... x =