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54=x-0.9x
We move all terms to the left:
54-(x-0.9x)=0
We add all the numbers together, and all the variables
-(+0.1x)+54=0
We get rid of parentheses
-0.1x+54=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-54
x=-54/-0.1
x=+540
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