Add 5 to both sides, to get:
+5 + 4 - ( ¾ )x = +5 - 5
9 - ( ¾ )x = 0

Add ( ¾ )x to both side:
9 = ( ¾ )x

Multiply both sides by 4, to get:
(4)(9) = (4)( ¾ )x
36 = 3x

Divide both sides by 3:

x = 12