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0.2b=0.5b+3
We move all terms to the left:
0.2b-(0.5b+3)=0
We get rid of parentheses
0.2b-0.5b-3=0
We add all the numbers together, and all the variables
-0.3b-3=0
We move all terms containing b to the left, all other terms to the right
-0.3b=3
b=3/-0.3
b=-10
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