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17.5=0.5b*7
We move all terms to the left:
17.5-(0.5b*7)=0
We add all the numbers together, and all the variables
-(+0.5b*7)+17.5=0
We get rid of parentheses
-0.5b*7+17.5=0
We move all terms containing b to the left, all other terms to the right
-0.5b*7=-17.5
b=-17.5/1
b=-17.5
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