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.5(x+12)=100
We move all terms to the left:
.5(x+12)-(100)=0
We multiply parentheses
0.5x+6-100=0
We add all the numbers together, and all the variables
0.5x-94=0
We move all terms containing x to the left, all other terms to the right
0.5x=94
x=94/0.5
x=188
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