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0.002b+0.05=0.5
We move all terms to the left:
0.002b+0.05-(0.5)=0
We add all the numbers together, and all the variables
0.002b-0.45=0
We move all terms containing b to the left, all other terms to the right
0.002b=0.45
b=0.45/0.002
b=225
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