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99=x+5.4
We move all terms to the left:
99-(x+5.4)=0
We get rid of parentheses
-x-5.4+99=0
We add all the numbers together, and all the variables
-1x+93.6=0
We move all terms containing x to the left, all other terms to the right
-x=-93.6
x=-93.6/-1
x=93+0.59999999999999/1
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