40=90-b

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Solution for 40=90-b equation: 



40=90-b

We move all terms to the left:

40-(90-b)=0

We add all the numbers together, and all the variables

-(-1b+90)+40=0

We get rid of parentheses

1b-90+40=0

We add all the numbers together, and all the variables

b-50=0

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

b=50

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