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100=10+3b
We move all terms to the left:
100-(10+3b)=0
We add all the numbers together, and all the variables
-(3b+10)+100=0
We get rid of parentheses
-3b-10+100=0
We add all the numbers together, and all the variables
-3b+90=0
We move all terms containing b to the left, all other terms to the right
-3b=-90
b=-90/-3
b=+30
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