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-20=4x-5x-9
We move all terms to the left:
-20-(4x-5x-9)=0
We add all the numbers together, and all the variables
-(-1x-9)-20=0
We get rid of parentheses
1x+9-20=0
We add all the numbers together, and all the variables
x-11=0
We move all terms containing x to the left, all other terms to the right
x=11
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