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-2x+9.9=3.5
We move all terms to the left:
-2x+9.9-(3.5)=0
We add all the numbers together, and all the variables
-2x+6.4=0
We move all terms containing x to the left, all other terms to the right
-2x=-6.4
x=-6.4/-2
x=3+0.4/2
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