b+b-2b+2b=8

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Solution for b+b-2b+2b=8 equation: 



b+b-2b+2b=8

We move all terms to the left:

b+b-2b+2b-(8)=0

We add all the numbers together, and all the variables

2b-8=0

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

2b=8

b=8/2

b=4

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