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x+0.40x=2.4
We move all terms to the left:
x+0.40x-(2.4)=0
We add all the numbers together, and all the variables
1.4x-2.4=0
We move all terms containing x to the left, all other terms to the right
1.4x=2.4
x=2.4/1.4
x=1+1/1.4
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