N=0.8(210-a)

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Solution for N=0.8(210-a) equation: 



=0.8(210-N)

We move all terms to the left:

-(0.8(210-N))=0

We add all the numbers together, and all the variables

-(0.8(-1N+210))=0



We calculate terms in parentheses: -(0.8(-1N+210)), so:

0.8(-1N+210)

We multiply parentheses

-0.8N+168

Back to the equation:

-(-0.8N+168)



We get rid of parentheses

0.8N-168=0

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

0.8N=168

N=168/0.8

N=210

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