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10.5=5.5+x.x=
We move all terms to the left:
10.5-(5.5+x.x)=0
We add all the numbers together, and all the variables
-(x.x+5.5)+10.5=0
We get rid of parentheses
-x.x-5.5+10.5=0
We add all the numbers together, and all the variables
-x.x+5=0
We move all terms containing x to the left, all other terms to the right
-x.x=-5
x=-5/1
x=-5
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