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100-(10+10b)=140
We move all terms to the left:
100-(10+10b)-(140)=0
We add all the numbers together, and all the variables
-(10b+10)+100-140=0
We add all the numbers together, and all the variables
-(10b+10)-40=0
We get rid of parentheses
-10b-10-40=0
We add all the numbers together, and all the variables
-10b-50=0
We move all terms containing b to the left, all other terms to the right
-10b=50
b=50/-10
b=-5
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