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-2.1b+5.3=b-3.1b+5.3=
We move all terms to the left:
-2.1b+5.3-(b-3.1b+5.3)=0
We add all the numbers together, and all the variables
-2.1b-(-2.1b+5.3)+5.3=0
We get rid of parentheses
-2.1b+2.1b-5.3+5.3=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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