40-3b=30-b

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Solution for 40-3b=30-b equation: 



40-3b=30-b

We move all terms to the left:

40-3b-(30-b)=0

We add all the numbers together, and all the variables

-3b-(-1b+30)+40=0

We get rid of parentheses

-3b+1b-30+40=0

We add all the numbers together, and all the variables

-2b+10=0

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

-2b=-10

b=-10/-2

b=+5

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