4(0.45-b)+9b=2.8

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Solution for 4(0.45-b)+9b=2.8 equation: 



4(0.45-b)+9b=2.8

We move all terms to the left:

4(0.45-b)+9b-(2.8)=0

We add all the numbers together, and all the variables

4(-1b+0.45)+9b-(2.8)=0

We add all the numbers together, and all the variables

9b+4(-1b+0.45)-2.8=0

We multiply parentheses

9b-4b+1.8-2.8=0

We add all the numbers together, and all the variables

5b-1=0

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

5b=1

b=1/5

b=1/5

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