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11+9x=3x-20
We move all terms to the left:
11+9x-(3x-20)=0
We get rid of parentheses
9x-3x+20+11=0
We add all the numbers together, and all the variables
6x+31=0
We move all terms containing x to the left, all other terms to the right
6x=-31
x=-31/6
x=-5+1/6
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