b=(1(1+399))/2

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Solution for b=(1(1+399))/2 equation: 



b=(1(1+399))/2

We move all terms to the left:

b-((1(1+399))/2)=0

We add all the numbers together, and all the variables

b-((1400)/2)=0

We add all the numbers together, and all the variables

b-(1400/2)=0

We get rid of parentheses

b-1400/2=0

We multiply all the terms by the denominator


b*2-1400=0

Wy multiply elements

2b-1400=0

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

2b=1400

b=1400/2

b=700

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