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3x-12-6=12.5
We move all terms to the left:
3x-12-6-(12.5)=0
We add all the numbers together, and all the variables
3x-30.5=0
We move all terms containing x to the left, all other terms to the right
3x=30.5
x=30.5/3
x=10+0.5/3
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