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0.4*50+x)/(50+x)=0.6
We move all terms to the left:
0.4*50+x)/(50+x)-(0.6)=0
We add all the numbers together, and all the variables
x)/(x+50)-(0.6)+0.4*50=0
We add all the numbers together, and all the variables
x)/(x=0
We multiply all the terms by the denominator
x)=0
x=0/1
x=0
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