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6x-21=8x-5
We move all terms to the left:
6x-21-(8x-5)=0
We get rid of parentheses
6x-8x+5-21=0
We add all the numbers together, and all the variables
-2x-16=0
We move all terms containing x to the left, all other terms to the right
-2x=16
x=16/-2
x=-8
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