Question 243004
x+300,000+400,000+800,000=4 3/4x 
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Add the numbers
x + 1,500,000 = (4 3/4)x I think that's what you mean.
Subtrace x from both sides
1,500,000 = (3 3/4)x
1,500,000 = 15x/4
Multiply both sides by 4
6,000,000 = 15x
Divide by 15
x = 400,000 (miles?  kilometers?)