9=-0.42*12+b

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Solution for 9=-0.42*12+b equation: 



9=-0.42*12+b

We move all terms to the left:

9-(-0.42*12+b)=0

We add all the numbers together, and all the variables

-(b-5.04)+9=0

We get rid of parentheses

-b+5.04+9=0

We add all the numbers together, and all the variables

-1b+14.04=0

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

-b=-14.04

b=-14.04/-1

b=14+0.039999999999999/1

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