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0.1x+180=x-270
We move all terms to the left:
0.1x+180-(x-270)=0
We get rid of parentheses
0.1x-x+270+180=0
We add all the numbers together, and all the variables
-0.9x+450=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-450
x=-450/-0.9
x=+500
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