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0.5x+0.4=0.8
We move all terms to the left:
0.5x+0.4-(0.8)=0
We add all the numbers together, and all the variables
0.5x-0.4=0
We move all terms containing x to the left, all other terms to the right
0.5x=0.4
x=0.4/0.5
x=0.4/0.5
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