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.5x+.25(30)=21.5
We move all terms to the left:
.5x+.25(30)-(21.5)=0
We add all the numbers together, and all the variables
.5x-21.247=0
We move all terms containing x to the left, all other terms to the right
.5x=21.247
x=21.247/.5
x=42+0.247/.5
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