x=3
Step-by-step explanation:
1. Subtract 4x from both sides
  12=6x+6−4x
2.  Simplify  6x+6-4x to 2x+6
  12=2x+6
3. Subtract 6 from both sides
  12−6=2x
4. Simplify 12-6 to 6
  6=2x
5. Divide both sides by 2
  6/2=x
6. Simplify 6/2 to 3
7. x=3
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