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0.2x+0.8=0.9
We move all terms to the left:
0.2x+0.8-(0.9)=0
We add all the numbers together, and all the variables
0.2x-0.1=0
We move all terms containing x to the left, all other terms to the right
0.2x=0.1
x=0.1/0.2
x=0.1/0.2
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