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b^2+2b^2-3b^2+b^2=(1+2-3+1)b^2
We move all terms to the left:
b^2+2b^2-3b^2+b^2-((1+2-3+1)b^2)=0
We add all the numbers together, and all the variables
b^2+2b^2-3b^2+b^2-(1b^2)=0
We add all the numbers together, and all the variables
=0
b=0/1
b=0
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