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x.x-3.5=5.2
We move all terms to the left:
x.x-3.5-(5.2)=0
We add all the numbers together, and all the variables
x.x-8.7=0
We move all terms containing x to the left, all other terms to the right
x.x=8.7
x=8.7/1
x=8.7
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