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2.4x-1.2=8.1
We move all terms to the left:
2.4x-1.2-(8.1)=0
We add all the numbers together, and all the variables
2.4x-9.3=0
We move all terms containing x to the left, all other terms to the right
2.4x=9.3
x=9.3/2.4
x=3+1/1.1428571428571
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