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-x+1.2=12.3
We move all terms to the left:
-x+1.2-(12.3)=0
We add all the numbers together, and all the variables
-1x-11.1=0
We move all terms containing x to the left, all other terms to the right
-x=11.1
x=11.1/-1
x=-11+0.1/1
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