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13x-221=3x-11
We move all terms to the left:
13x-221-(3x-11)=0
We get rid of parentheses
13x-3x+11-221=0
We add all the numbers together, and all the variables
10x-210=0
We move all terms containing x to the left, all other terms to the right
10x=210
x=210/10
x=21
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