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13+11x=289-12x
We move all terms to the left:
13+11x-(289-12x)=0
We add all the numbers together, and all the variables
11x-(-12x+289)+13=0
We get rid of parentheses
11x+12x-289+13=0
We add all the numbers together, and all the variables
23x-276=0
We move all terms containing x to the left, all other terms to the right
23x=276
x=276/23
x=12
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