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1200-x=0.15
We move all terms to the left:
1200-x-(0.15)=0
We add all the numbers together, and all the variables
-1x+1199.85=0
We move all terms containing x to the left, all other terms to the right
-x=-1199.85
x=-1199.85/-1
x=1199+0.85/1
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