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10-2b=b+7
We move all terms to the left:
10-2b-(b+7)=0
We get rid of parentheses
-2b-b-7+10=0
We add all the numbers together, and all the variables
-3b+3=0
We move all terms containing b to the left, all other terms to the right
-3b=-3
b=-3/-3
b=1
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