47=77-b;20,30,40

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Solution for 47=77-b;20,30,40 equation: 



47=77-b20.30.40

We move all terms to the left:

47-(77-b20.30.40)=0

We add all the numbers together, and all the variables

-(-b20.30.40+77)+47=0

We get rid of parentheses

b20.30.40-77+47=0

We add all the numbers together, and all the variables

b20.30.40-30=0

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

b20.30.40=30

b=30/1

b=30

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