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(2x-51)81=90
We move all terms to the left:
(2x-51)81-(90)=0
We multiply parentheses
162x-4131-90=0
We add all the numbers together, and all the variables
162x-4221=0
We move all terms containing x to the left, all other terms to the right
162x=4221
x=4221/162
x=26+1/18
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