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3x+12.2=18.5
We move all terms to the left:
3x+12.2-(18.5)=0
We add all the numbers together, and all the variables
3x-6.3=0
We move all terms containing x to the left, all other terms to the right
3x=6.3
x=6.3/3
x=2+0.3/3
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