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.5(4x-6)=21
We move all terms to the left:
.5(4x-6)-(21)=0
We multiply parentheses
2x-3-21=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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