0.9(0.5b+0.8)-0.4(0.6b+1.8)=0.21b

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Solution for 0.9(0.5b+0.8)-0.4(0.6b+1.8)=0.21b equation: 



0.9(0.5b+0.8)-0.4(0.6b+1.8)=0.21b

We move all terms to the left:

0.9(0.5b+0.8)-0.4(0.6b+1.8)-(0.21b)=0

We add all the numbers together, and all the variables

0.9(0.5b+0.8)-0.4(0.6b+1.8)-(+0.21b)=0

We multiply parentheses

0b-0b-(+0.21b)+0.72-0.72=0

We get rid of parentheses

0b-0b-0.21b+0.72-0.72=0

We add all the numbers together, and all the variables

-0.21b=0

b=0/-0.21

b=0

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