400b+500b=9000

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Solution for 400b+500b=9000 equation: 



400b+500b=9000

We move all terms to the left:

400b+500b-(9000)=0

We add all the numbers together, and all the variables

900b-9000=0

We move all terms containing b to the left, all other terms to the right

900b=9000

b=9000/900

b=10

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