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=20.B-6
We move all terms to the left:
-(20.B-6)=0
We get rid of parentheses
-20.B+6=0
We add all the numbers together, and all the variables
-20B+6=0
We move all terms containing B to the left, all other terms to the right
-20B=-6
B=-6/-20
B=3/10
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