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8003=10b+3
We move all terms to the left:
8003-(10b+3)=0
We get rid of parentheses
-10b-3+8003=0
We add all the numbers together, and all the variables
-10b+8000=0
We move all terms containing b to the left, all other terms to the right
-10b=-8000
b=-8000/-10
b=+800
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