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11-12x=-20-9x
We move all terms to the left:
11-12x-(-20-9x)=0
We add all the numbers together, and all the variables
-12x-(-9x-20)+11=0
We get rid of parentheses
-12x+9x+20+11=0
We add all the numbers together, and all the variables
-3x+31=0
We move all terms containing x to the left, all other terms to the right
-3x=-31
x=-31/-3
x=10+1/3
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