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2x-(6x+20)=180
We move all terms to the left:
2x-(6x+20)-(180)=0
We get rid of parentheses
2x-6x-20-180=0
We add all the numbers together, and all the variables
-4x-200=0
We move all terms containing x to the left, all other terms to the right
-4x=200
x=200/-4
x=-50
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