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4x-21=8x-5
We move all terms to the left:
4x-21-(8x-5)=0
We get rid of parentheses
4x-8x+5-21=0
We add all the numbers together, and all the variables
-4x-16=0
We move all terms containing x to the left, all other terms to the right
-4x=16
x=16/-4
x=-4
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