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102x+51=168x-21
We move all terms to the left:
102x+51-(168x-21)=0
We get rid of parentheses
102x-168x+21+51=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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