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4.2+b=6.5b
We move all terms to the left:
4.2+b-(6.5b)=0
We add all the numbers together, and all the variables
b-(+6.5b)+4.2=0
We get rid of parentheses
b-6.5b+4.2=0
We add all the numbers together, and all the variables
-5.5b+4.2=0
We move all terms containing b to the left, all other terms to the right
-5.5b=-4.2
b=-4.2/-5.5
b=3.5/4.5833333333333
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