Answer:
-6
Explanation:
5x+12=4x+6
We simplify the equation to the form, which is simple to understand 
5x+12=4x+6
We move all terms containing x to the left and all other terms to the right. 
+5x-4x=+6-12
We simplify the left and right the side of the equation. 
+1x=-6
We divide both sides of the equation by 1 to get x. 
x=-6