b+4.2=7.7

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Solution for b+4.2=7.7 equation: 



b+4.2=7.7

We move all terms to the left:

b+4.2-(7.7)=0

We add all the numbers together, and all the variables

b-3.5=0

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

b=3.5

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