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3.5x-8.4=x
We move all terms to the left:
3.5x-8.4-(x)=0
We add all the numbers together, and all the variables
2.5x-8.4=0
We move all terms containing x to the left, all other terms to the right
2.5x=8.4
x=8.4/2.5
x=3+0.9/2.5
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