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0.2b+3=0.5b+18
We move all terms to the left:
0.2b+3-(0.5b+18)=0
We get rid of parentheses
0.2b-0.5b-18+3=0
We add all the numbers together, and all the variables
-0.3b-15=0
We move all terms containing b to the left, all other terms to the right
-0.3b=15
b=15/-0.3
b=-50
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