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3x+2.7=8.4
We move all terms to the left:
3x+2.7-(8.4)=0
We add all the numbers together, and all the variables
3x-5.7=0
We move all terms containing x to the left, all other terms to the right
3x=5.7
x=5.7/3
x=1+2.7/3
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