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1200+1.10-2.50=x
We move all terms to the left:
1200+1.10-2.50-(x)=0
We add all the numbers together, and all the variables
-1x+1198.6=0
We move all terms containing x to the left, all other terms to the right
-x=-1198.6
x=-1198.6/-1
x=1198+0.59999999999991/1
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