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2.1b+5=6b+8.65
We move all terms to the left:
2.1b+5-(6b+8.65)=0
We get rid of parentheses
2.1b-6b-8.65+5=0
We add all the numbers together, and all the variables
-3.9b-3.65=0
We move all terms containing b to the left, all other terms to the right
-3.9b=3.65
b=3.65/-3.9
b=-1/1.0684931506849
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