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x.x-2.7=0.8
We move all terms to the left:
x.x-2.7-(0.8)=0
We add all the numbers together, and all the variables
x.x-3.5=0
We move all terms containing x to the left, all other terms to the right
x.x=3.5
x=3.5/1
x=3.5
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