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9.9=x+54
We move all terms to the left:
9.9-(x+54)=0
We get rid of parentheses
-x-54+9.9=0
We add all the numbers together, and all the variables
-1x-44.1=0
We move all terms containing x to the left, all other terms to the right
-x=44.1
x=44.1/-1
x=-44+0.1/1
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