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69(2x-1)=90
We move all terms to the left:
69(2x-1)-(90)=0
We multiply parentheses
138x-69-90=0
We add all the numbers together, and all the variables
138x-159=0
We move all terms containing x to the left, all other terms to the right
138x=159
x=159/138
x=1+7/46
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