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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

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

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

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