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x=0.8x+300
We move all terms to the left:
x-(0.8x+300)=0
We get rid of parentheses
x-0.8x-300=0
We add all the numbers together, and all the variables
0.2x-300=0
We move all terms containing x to the left, all other terms to the right
0.2x=300
x=300/0.2
x=1500
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