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55=10+0.30b
We move all terms to the left:
55-(10+0.30b)=0
We add all the numbers together, and all the variables
-(0.30b+10)+55=0
We get rid of parentheses
-0.30b-10+55=0
We add all the numbers together, and all the variables
-0.3b+45=0
We move all terms containing b to the left, all other terms to the right
-0.3b=-45
b=-45/-0.3
b=+150
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