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2.5x+0.3=8.4
We move all terms to the left:
2.5x+0.3-(8.4)=0
We add all the numbers together, and all the variables
2.5x-8.1=0
We move all terms containing x to the left, all other terms to the right
2.5x=8.1
x=8.1/2.5
x=3+0.6/2.5
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