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6x+21=9x+19
We move all terms to the left:
6x+21-(9x+19)=0
We get rid of parentheses
6x-9x-19+21=0
We add all the numbers together, and all the variables
-3x+2=0
We move all terms containing x to the left, all other terms to the right
-3x=-2
x=-2/-3
x=2/3
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