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x+.85x=1200
We move all terms to the left:
x+.85x-(1200)=0
We add all the numbers together, and all the variables
1.85x-1200=0
We move all terms containing x to the left, all other terms to the right
1.85x=1200
x=1200/1.85
x=648+1/1.5416666666666
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