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x+0.15x=104.5
We move all terms to the left:
x+0.15x-(104.5)=0
We add all the numbers together, and all the variables
1.15x-104.5=0
We move all terms containing x to the left, all other terms to the right
1.15x=104.5
x=104.5/1.15
x=90+1/1.15
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