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0.4x-0.2=8.4
We move all terms to the left:
0.4x-0.2-(8.4)=0
We add all the numbers together, and all the variables
0.4x-8.6=0
We move all terms containing x to the left, all other terms to the right
0.4x=8.6
x=8.6/0.4
x=21+0.2/0.4
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