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.1x+x=1215.5
We move all terms to the left:
.1x+x-(1215.5)=0
We add all the numbers together, and all the variables
1.1x-1215.5=0
We move all terms containing x to the left, all other terms to the right
1.1x=1215.5
x=1215.5/1.1
x=1105
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