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13x-21=19x+3
We move all terms to the left:
13x-21-(19x+3)=0
We get rid of parentheses
13x-19x-3-21=0
We add all the numbers together, and all the variables
-6x-24=0
We move all terms containing x to the left, all other terms to the right
-6x=24
x=24/-6
x=-4
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