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21x-4=16x+6
We move all terms to the left:
21x-4-(16x+6)=0
We get rid of parentheses
21x-16x-6-4=0
We add all the numbers together, and all the variables
5x-10=0
We move all terms containing x to the left, all other terms to the right
5x=10
x=10/5
x=2
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