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4x-11=13x+21
We move all terms to the left:
4x-11-(13x+21)=0
We get rid of parentheses
4x-13x-21-11=0
We add all the numbers together, and all the variables
-9x-32=0
We move all terms containing x to the left, all other terms to the right
-9x=32
x=32/-9
x=-3+5/9
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