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21x=5+16x
We move all terms to the left:
21x-(5+16x)=0
We add all the numbers together, and all the variables
21x-(16x+5)=0
We get rid of parentheses
21x-16x-5=0
We add all the numbers together, and all the variables
5x-5=0
We move all terms containing x to the left, all other terms to the right
5x=5
x=5/5
x=1
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