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x+0.4x=3.8
We move all terms to the left:
x+0.4x-(3.8)=0
We add all the numbers together, and all the variables
1.4x-3.8=0
We move all terms containing x to the left, all other terms to the right
1.4x=3.8
x=3.8/1.4
x=2+1/1.4
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