-21=0.4(15)+b

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Solution for -21=0.4(15)+b equation: 



-21=0.4(15)+b

We move all terms to the left:

-21-(0.4(15)+b)=0

We add all the numbers together, and all the variables

-(b+0.415)-21=0

We get rid of parentheses

-b-0.415-21=0

We add all the numbers together, and all the variables

-1b-21.415=0

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

-b=21.415

b=21.415/-1

b=-21+0.415/1

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