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20=2+b/5
We move all terms to the left:
20-(2+b/5)=0
We add all the numbers together, and all the variables
-(b/5+2)+20=0
We get rid of parentheses
-b/5-2+20=0
We multiply all the terms by the denominator
-b-2*5+20*5=0
We add all the numbers together, and all the variables
-1b+90=0
We move all terms containing b to the left, all other terms to the right
-b=-90
b=-90/-1
b=+90
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