Answer :

4x-12 greater than or equal to 20
You add both sides to het 4x by itself
4x greater than or equal to 32
You divide both sides by 4 to get x by itself
Your answer is x is greater than or equal to 8
4x-12 > or = 20
Add 12 to both sides. 
4x > or = 32
Divide 4 on both sides. 
x > or = 8

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