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12=10-b
We move all terms to the left:
12-(10-b)=0
We add all the numbers together, and all the variables
-(-1b+10)+12=0
We get rid of parentheses
1b-10+12=0
We add all the numbers together, and all the variables
b+2=0
We move all terms containing b to the left, all other terms to the right
b=-2
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