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168x-21=102x+51
We move all terms to the left:
168x-21-(102x+51)=0
We get rid of parentheses
168x-102x-51-21=0
We add all the numbers together, and all the variables
66x-72=0
We move all terms containing x to the left, all other terms to the right
66x=72
x=72/66
x=1+1/11
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