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0.2x+0.07x=3240
We move all terms to the left:
0.2x+0.07x-(3240)=0
We add all the numbers together, and all the variables
0.27x-3240=0
We move all terms containing x to the left, all other terms to the right
0.27x=3240
x=3240/0.27
x=12000
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