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0.54=0.9x
We move all terms to the left:
0.54-(0.9x)=0
We add all the numbers together, and all the variables
-(+0.9x)+0.54=0
We get rid of parentheses
-0.9x+0.54=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-0.54
x=-0.54/-0.9
x=0.54/0.9
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