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17.87-17.5b=-19.9b-13.09
We move all terms to the left:
17.87-17.5b-(-19.9b-13.09)=0
We get rid of parentheses
-17.5b+19.9b+13.09+17.87=0
We add all the numbers together, and all the variables
2.4b+30.96=0
We move all terms containing b to the left, all other terms to the right
2.4b=-30.96
b=-30.96/2.4
b=-12+1/1.11111111111
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