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8(2x-1)=21
We move all terms to the left:
8(2x-1)-(21)=0
We multiply parentheses
16x-8-21=0
We add all the numbers together, and all the variables
16x-29=0
We move all terms containing x to the left, all other terms to the right
16x=29
x=29/16
x=1+13/16
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