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=40.50-0.07B
We move all terms to the left:
-(40.50-0.07B)=0
We add all the numbers together, and all the variables
-(-0.07B+40.5)=0
We get rid of parentheses
0.07B-40.5=0
We move all terms containing B to the left, all other terms to the right
0.07B=40.5
B=40.5/0.07
B=578+0.039999999999999/0.07
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