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11=2x-4x-9
We move all terms to the left:
11-(2x-4x-9)=0
We add all the numbers together, and all the variables
-(-2x-9)+11=0
We get rid of parentheses
2x+9+11=0
We add all the numbers together, and all the variables
2x+20=0
We move all terms containing x to the left, all other terms to the right
2x=-20
x=-20/2
x=-10
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