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300+0.3(x)=x
We move all terms to the left:
300+0.3(x)-(x)=0
We add all the numbers together, and all the variables
-0.7x+300=0
We move all terms containing x to the left, all other terms to the right
-0.7x=-300
x=-300/-0.7
x=428+0.40000000000003/0.7
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