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x-0.3x=318.5
We move all terms to the left:
x-0.3x-(318.5)=0
We add all the numbers together, and all the variables
0.7x-318.5=0
We move all terms containing x to the left, all other terms to the right
0.7x=318.5
x=318.5/0.7
x=455
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