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10-3b=9b-50
We move all terms to the left:
10-3b-(9b-50)=0
We get rid of parentheses
-3b-9b+50+10=0
We add all the numbers together, and all the variables
-12b+60=0
We move all terms containing b to the left, all other terms to the right
-12b=-60
b=-60/-12
b=+5
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