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x+0.2+x+x-0.23=0.9
We move all terms to the left:
x+0.2+x+x-0.23-(0.9)=0
We add all the numbers together, and all the variables
3x-0.93=0
We move all terms containing x to the left, all other terms to the right
3x=0.93
x=0.93/3
x=0.93/3
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