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83=10b+3
We move all terms to the left:
83-(10b+3)=0
We get rid of parentheses
-10b-3+83=0
We add all the numbers together, and all the variables
-10b+80=0
We move all terms containing b to the left, all other terms to the right
-10b=-80
b=-80/-10
b=+8
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