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-20b-18=-5-20b-13
We move all terms to the left:
-20b-18-(-5-20b-13)=0
We add all the numbers together, and all the variables
-20b-(-20b-18)-18=0
We get rid of parentheses
-20b+20b+18-18=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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