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5x+21=20x+34=12x-14
We move all terms to the left:
5x+21-(20x+34)=0
We get rid of parentheses
5x-20x-34+21=0
We add all the numbers together, and all the variables
-15x-13=0
We move all terms containing x to the left, all other terms to the right
-15x=13
x=13/-15
x=-13/15
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