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.1x+x=693.9
We move all terms to the left:
.1x+x-(693.9)=0
We add all the numbers together, and all the variables
1.1x-693.9=0
We move all terms containing x to the left, all other terms to the right
1.1x=693.9
x=693.9/1.1
x=630+0.89999999999998/1.1
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