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19x+13=12x+34
We move all terms to the left:
19x+13-(12x+34)=0
We get rid of parentheses
19x-12x-34+13=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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