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.3x-x=45000
We move all terms to the left:
.3x-x-(45000)=0
We add all the numbers together, and all the variables
-0.7x-45000=0
We move all terms containing x to the left, all other terms to the right
-0.7x=45000
x=45000/-0.7
x=-64285+0.5/0.7
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