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2x=0.9-0.1x
We move all terms to the left:
2x-(0.9-0.1x)=0
We add all the numbers together, and all the variables
2x-(-0.1x+0.9)=0
We get rid of parentheses
2x+0.1x-0.9=0
We add all the numbers together, and all the variables
2.1x-0.9=0
We move all terms containing x to the left, all other terms to the right
2.1x=0.9
x=0.9/2.1
x=0.9/2.1
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