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12.13=5+3b-13
We move all terms to the left:
12.13-(5+3b-13)=0
We add all the numbers together, and all the variables
-(3b-8)+12.13=0
We get rid of parentheses
-3b+8+12.13=0
We add all the numbers together, and all the variables
-3b+20.13=0
We move all terms containing b to the left, all other terms to the right
-3b=-20.13
b=-20.13/-3
b=6+2.13/3
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