8.4=2.4-3b

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Solution for 8.4=2.4-3b equation: 



8.4=2.4-3b

We move all terms to the left:

8.4-(2.4-3b)=0

We add all the numbers together, and all the variables

-(-3b+2.4)+8.4=0

We get rid of parentheses

3b-2.4+8.4=0

We add all the numbers together, and all the variables

3b+6=0

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

3b=-6

b=-6/3

b=-2

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