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=20.50-0.08B
We move all terms to the left:
-(20.50-0.08B)=0
We add all the numbers together, and all the variables
-(-0.08B+20.5)=0
We get rid of parentheses
0.08B-20.5=0
We move all terms containing B to the left, all other terms to the right
0.08B=20.5
B=20.5/0.08
B=256+0.02/0.08
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