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x.x+3.2=-9.2
We move all terms to the left:
x.x+3.2-(-9.2)=0
We add all the numbers together, and all the variables
x.x+12.4=0
We move all terms containing x to the left, all other terms to the right
x.x=-12.4
x=-12.4/1
x=-12.4
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