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0.5x+0.2-0.1x=0.4
We move all terms to the left:
0.5x+0.2-0.1x-(0.4)=0
We add all the numbers together, and all the variables
0.4x-0.2=0
We move all terms containing x to the left, all other terms to the right
0.4x=0.2
x=0.2/0.4
x=0.2/0.4
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