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2x+5.5=21.55
We move all terms to the left:
2x+5.5-(21.55)=0
We add all the numbers together, and all the variables
2x-16.05=0
We move all terms containing x to the left, all other terms to the right
2x=16.05
x=16.05/2
x=8+0.050000000000001/2
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