b=90+(20+7)

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Solution for b=90+(20+7) equation: 



b=90+(20+7)

We move all terms to the left:

b-(90+(20+7))=0

We add all the numbers together, and all the variables

b-(90+27)=0

We add all the numbers together, and all the variables

b-117=0

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

b=117

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