2a=B-1

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Solution for 2a=B-1 equation: 



2a=-1

We move all terms to the left:

2a-(-1)=0

We add all the numbers together, and all the variables

2a+1=0

We move all terms containing a to the left, all other terms to the right

2a=-1

a=-1/2

a=-1/2

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