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2.5=x.9
We move all terms to the left:
2.5-(x.9)=0
We add all the numbers together, and all the variables
-(+x.9)+2.5=0
We get rid of parentheses
-x.9+2.5=0
We move all terms containing x to the left, all other terms to the right
-x.9=-2.5
x=-2.5/1
x=-2.5
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