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21x-23=51-16x
We move all terms to the left:
21x-23-(51-16x)=0
We add all the numbers together, and all the variables
21x-(-16x+51)-23=0
We get rid of parentheses
21x+16x-51-23=0
We add all the numbers together, and all the variables
37x-74=0
We move all terms containing x to the left, all other terms to the right
37x=74
x=74/37
x=2
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