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11x+2=5x+21
We move all terms to the left:
11x+2-(5x+21)=0
We get rid of parentheses
11x-5x-21+2=0
We add all the numbers together, and all the variables
6x-19=0
We move all terms containing x to the left, all other terms to the right
6x=19
x=19/6
x=3+1/6
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