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0.2x=0.9=0.3-0.1x
We move all terms to the left:
0.2x-(0.9)=0
We add all the numbers together, and all the variables
0.2x-0.9=0
We move all terms containing x to the left, all other terms to the right
0.2x=0.9
x=0.9/0.2
x=4+0.1/0.2
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