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13x-16=4x+11=12
We move all terms to the left:
13x-16-(4x+11)=0
We get rid of parentheses
13x-4x-11-16=0
We add all the numbers together, and all the variables
9x-27=0
We move all terms containing x to the left, all other terms to the right
9x=27
x=27/9
x=3
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